2-6
Service Guide
Table 2-2
PCI1250 Terminal Functions
Name
No.
I/O Type
Function
PCI Address and Data Terminals
AD31
AD30
AD29
AD28
AD27
AD26
AD25
AD24
AD23
AD22
AD21
AD20
AD19
AD18
AD17
AD16
AD15
AD14
AD13
AD12
AD11
AD10
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
K18
K19
L20
L18
L19
M20
M19
M18
N19
N18
P20
P19
R20
R19
P17
R18
V18
Y19
W18
V17
U16
Y18
W17
V16
W16
U14
Y16
W15
V14
Y15
W14
Y14
PCI address data bus. These signals make up the
multiplexed PCI address and data bus on the
primary interface. During the address phase of a
primary bus PCI cycle, AD31:0 contain a 32-bit
address or other destination. During the data
phase AD31 0 contain data.
C/BE3
C/BE2
C/BE1
C/BE0
M17
T20
W19
Y17
I/O
PCI bus commands and byte enables. These
signals are multiplexed on the same PCI terminals.
During address phase of a primary bus PCI cycle,
C/BE3:0 define the bus command. During the data
phase, this four-bit bus is used as byte enables.
The byte enables determine which byte paths of the
full 32-bit data bus carry meaningful data. C/BE0
applies to byte 0 (AD7:0), C/BE1 applies to byte 1
(AD15:8), C/be2 applies to byte 2 (AD23:16) and
C/BE3 applies to byte 3 (AD31:24).
PAR
Y20
I/O
PCI bus party In all PCI bus read and write cycles
the PCI1250A calculates even parity across the
AD31:0 and C/BE3:0 buses. As an initiator during
PCI cycles, the PCI1250A outputs this parity
indicator with a one PCLK delay. As a target during
PCI cycles. the calculated parity is compared to the
initiators parity indicator. A miscompare can result
in the assertion of a parity error (PERR).
Summary of Contents for 390 Series
Page 15: ...System Introduction 1 3 Figure 1 2 PCB No 96183 1A Mainboard Layout Bottom ...
Page 96: ...2 50 Service Guide 2 3 3 Pin Configuration Figure 2 4 FDC37C67 TQFP Pin Diagram ...
Page 97: ...Major Chips Description 2 51 Figure 2 5 FDC37C67 QFP Pin Diagram ...
Page 102: ...2 56 Service Guide 2 3 6 Block Diagram Figure 2 6 FDC37C67 Block Diagram ...
Page 126: ...2 80 Service Guide 2 5 4 1 Functional Block Diagram Figure 2 10 M38813 Block Diagram ...
Page 128: ...2 82 Service Guide 2 6 2 Pin Diagram Figure 2 11 YMF715 Block Diagram ...
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