........................................................................................................

PINOUT 486 & 586

 


Microprocessor 486 . 169 pins - 17x17 Pin Grid Array.

    1   2   3   4   5   6   7   8   9   10  11  12  13  14  15  16  17
  |-------------------------------------------------------------------|
S | o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
  |                                                                   |
R | o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
  |                                                                   |
Q | o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
  |                -----------------------------------                |
P | o   o   o    /                                         o   o   o |
  |            /                                                     |
N | o   o   o |                                           | o   o   o |
  |           |                                           |           |
M | o   o   o |                                           | o   o   o |
  |           |                                           |           |
L | o   o   o |                                           | o   o   o |
  |           |                                           |           |
K | o   o   o |                                           | o   o   o |
  |           |                BOTTOM VIEW                |           |
J | o   o   o |                (pin side)                 | o   o   o |
  |           |                                           |           |
H | o   o   o |                                           | o   o   o |
  |           |                                           |           |
G | o   o   o |                                           | o   o   o |
  |           |                                           |           |
F | o   o   o |                                           | o   o   o |
  |           |                                           |           |
E | o   o   o |                                           | o   o   o |
  |                                                     /            |
D | o   o   o   o                                     /    o   o   o |
  |                -----------------------------------                |
C | o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
  |                                                                   |
B | o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
  |                                                                   |
A  o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o   o |
   ------------------------------------------------------------------|
    1   2   3   4   5   6   7   8   9   10  11  12  13  14  15  16  17

 

PIN Function
A2 - A31 Address pins.
A20M# Address bit 20 Mask pin.
ADS# Address Status.
AHOLD Address Hold.
BE0 - BE3# Byte Enable pins.
BLAST# Burst Last.
BOFF# Back Off input.
BRDY# Burst Ready.
BRDYC# Cache Burst Ready.
BREQ Bus Request.
BS8# Bus Size 8.
BS16# Bus Size 16.
CACHE# Cache.
CLK Clock input. Provides fundamental timing for the processor.
CLKMUL Clock Multiplier pin (Bus Frequency).
Usually 2.0x or 3.0x, though it can be 2.5x or 4.0x, depending on the chip.
D0 - D31 Data pins.
D/C# Data/Code. Primary bus cycle definition pin.
DP0 - DP3 Data Parity pins.
EADS# External Address Strobe.
FERR# Floating Point Error.
FLUSH# Cache Flush.
HITM# Hit to a Modified line.
HLDA Hold Acknowledge.
HOLD Bus Hold request.
IGNNE# Ignore Numeric Error.
INTR Mask able Interrupt.
INV Invalidate.
INVAL Invalidate.
KEN# Cache Enable.
KEY Key pin. Non-functional pin to prevent incorrect CPU insertion.
LOCK# Bus Lock.
M/IO# Memory/Input-Output. Primary bus cycle definition pin.
MP# Math-coprocessor Present. When pulled low, the processor enters a powered-down tri state mode, allowing the math-coprocessor to take control.
NMI Non-Mask able Interrupt.
PCD Page Cache Disable.
PCHK# Parity Status.
PLOCK# Pseudo-Lock.
PWT Page Write-Through.
RDY# Non-burst Ready.
RESET Reset.
RPLSET0 ?.
RPLSET1 ?.
RPLVAL# ?.
SMADS# System Management Interrupt Address Strobe.
SMI# System Management Interrupt. Allows processor to enter system management mode.
SMIACT# System Management Interrupt Active. Indicates that processor is in system management mode.
SRESET Soft Reset.
STPCLK# Stop Clock.
SUSP# Suspend. Same as STPCLK#.
SUSPA# ?.
TCK Test Clock.
TDI Test Data Input.
TDO Test Data Output.
TEST Test pin.
TMS Test Mode Select.
UP# Upgrade Present. When pulled low, the processor enters a powered-down tri state mode, allowing an upgrade processor to take control.
VOLDET Voltage Detect.
WB/WT# Write-Back / Write-Through.
WM_RST Warm Reset.
W/R Write / Read.

Microprocessor 586 - 321 pins - 19x19 (37x37) Staggered Pin Grid Array. Only the AMD K6 has this feature.

                               CORE voltage | I/O voltage
                               plane (Vcc2) | plane (Vcc3)
                                            |
     1   3   5   7   9   11  13  15  17  19 |21  23  25  27  29  31  33  35  37
       2   4   6   8   10  12  14  16  18  20  22  24  26  28  30  32  34  36
   |----------------------------------------|----------------------------------|
AN | o   o   o   o   o   o   o   o   o   o  |o   o   o   o   o   o   o   o   o | AN
AM |   o   o   o   o   o   o   o   o   o   o|  o   o   o   o   o   o   o   o   | AM
AL | o   o   o   o   o   o   o   o   o   o__|o   o   o   o   o   o   o   o   o | AL
AK |   o   o   o   o   o   o   o   o   o|  o   o   o   o   o   o   o   o   o   | AK
AJ | o   o   o   o   o   o   o   o   o  |o   o   o   o   o   o   o   o   o   o | AJ
AH |   o   o       ---------------------|-----------------------   x   o   o   | AH
AG | o   o   o   /                      |                           o   o   o | AG
AF |   o   o    /                       |                             o   o   | AF
AE | o   o   o |                        |                          | o   o   o | AE
AD |   o   o   |                        |                          |   o   o   | AD
AC | o   o   o |                        |                          | o   o   o | AC
AB |   o   o   |                        |                          |   o   o   | AB
AA | o   o   o |                        |                          | o   o   o | AA
Z  |   o   o   |                        |                          |   o   o   | Z
Y  | o   o   o |                        |                          | o   o   o | Y
X  |   o   o   |                        |                          |   o   o   | X
W  | o   o   o |                        |                          | o   o   o | W
V  |   o   o   |                    BOTTOM VIEW                    |   o   o   | V
U  | o   o   o |                    (pin side)                     | o   o   o | U
T  |   o   o   |                        |                          |   o   o   | T
S  | o   o   o |                        |                          | o   o   o | S
R  |   o   o   |                        |                          |   o   o   | R
Q  | o   o   o |                        |                          | o   o   o | Q
P  |   o   o   |                        |                          |   o   o   | P
N  | o   o   o |                        |                          | o   o   o | N
M  |   o   o   |                        |                          |   o   o   | M
L  | o   o   o |                        |                          | o   o   o | L
K  |   o   o   |                        |                          |   o   o   | K
J  | o   o   o |                        |                          | o   o   o | J
H  |   o   o                           |                         /    o   o   | H
G  | o   o   o                         |                        /   o   o   o | G
F  |   o   o   o   ---------------------|-----------------------       o   o   | F
E  | o   o   o   o   o   o   o   o   o  |o   o   o   o   o   o   o   o   o   o | E
D  |   o   o   o   o   o   o   o   o   o|  o   o   o   o   o   o   o   o   o   | D
C  | o   o   o   o   o   o   o   o   o  |o   o   o   o   o   o   o   o   o   o | C
B  |   o   o   o   o   o   o   o   o   o|  o   o   o   o   o   o   o   o   o   | B
A       o   o   o   o   o   o   o   o  |o   o   o   o   o   o   o   o   o   o | A
     ----------------------------------|--------------------------------------|
     1   3   5   7   9   11  13  15  17 |19  21  23  25  27  29  31  33  35  37
       2   4   6   8   10  12  14  16  18  20  22  24  26  28  30  32  34  36
                                        |
                           CORE voltage | I/O voltage
                           plane (Vcc2) | plane (Vcc3)

Common Pin Designations

A3 - A31 Address pins.
A20M# Address bit 20 Mask pin.
ADS# Address Status.
ADSC# Cache Address Strobe. Functionally the same as ADS#.
AP Address Parity.
APCHK# Address Parity Check.
BE0# - BE7# Byte Enable pins.
BF0 - BF2 Bus Frequency clock multiplier (bus to core frequency ratio).
1.5x and 2.0x when only BF0 is present.
1.5x, 2.0x, 2.5x, and 3.0x when BF0 and BF1 are present.
2.0x, 2.5x, 3.0x, 3.5x, 4.0x, 4.5x, 5.0x, and 5.5x when BF0, BF1, and BF2 are present.
[ Note: What multipliers are available is entirely dependent on the processor itself. ]
BOFF# Back off input.
BRDY# Burst Ready.
BRDYC# Cache Burst Ready. Functionally the same as BRDY#.
BREQ Bus Request.
BUSCHK# Bus Check.
CACHE# Cache.
CLK Clock input. Provides fundamental timing for the processor.
D/C# Data/Code. Primary bus cycle definition pin.
D0 - D63 Data pins.
DP0 - DP7 Data Parity pins.
EADS# External Address.
EWBE# External Write Buffer Empty.
FERR# Floating Point Error.
FLUSH# Cache flush.
HIT# Hit. Reflects the outcome of an inquire cycle.
HITM# Hit to a Modified line. Reflects outcome of an inquire cycle.
HLDA Bus Hold Acknowledge.
HOLD Bus Hold request.
IERR# Internal Error. Indicates parity or functional redundancy errors.
IGNNE# Ignore Numeric Error.
INIT Processor Initialization pin.
INTR/LINT0 Active mask able Interrupt. If APIC is enabled, this becomes LINT0.
INV Invalidation. Determines final cache line state.
KEN# Cache Enable.
LOCK# Bus Lock. Indicates that the current bus cycle is locked.
M/IO# Memory Input-Output. Primary bus cycle definition pin.
NA# Next Address. Indicates external memory system is ready to accept a new bus cycle.
NMI/LINT1 Non-Mask able Interrupt. If APIC is enabled, this becomes LINT1.
PCD Page Cache Disable.
PCHK# Parity Check.
PEN# Parity Enable.
PM0 - PM1 Performance Monitoring pins. Can also act as BreakPoint pins BP0 and BP1.
PRDY Probe Ready.
PWT Page Write Through.
R/S# Run/Stop. Places processor in an idle state.
RESET Reset.
SCYC Split Cycle.
SMI# System Management Interrupt. Allows processor to enter System Management Mode.
SMIACT# System Management Interrupt Active. Indicates that processor is in System Management Mode.
STPCLK# Stop Clock. Stops internal clock of processor causing core to consume less power.
TCK Testability Clock. Used to clock state information and data into and out of the processor during boundary scan.
TDI Test Data Input. Serial input for the test logic.
TDO Test Data Output. Serial output for the test logic.
TMS Test Mode Select.
TRST# Test Reset.
Vcc2DET Vcc2 Detect. Identifies processor that require a lower core voltage.
W/R# Write/Read. Primary bus cycle definition pin.
WB/WT# Write Back/Write Through. Allows data cache to be defined as write-back or write-through.


AMD Specific Pin Designations

KEY Key pin. Non-functional pin to prevent CPU insertion into a Socket 5 motherboard.
Vcc2H/L# Identifies core voltage of the K6 processor (model 7, 8, and 9 chips). AMD states:
"Upon sampling VCC2DET Low to identify dual-voltage processor requirements, system logic should sample Vcc2H/L# to identify the core voltage requirements for 2.9v and 3.2v products (High) and 2.2v products (Low)."

This information is from original page http://users.erols.com/chare/486pin.htm