Avago Technologies LSI53C1000R - Manual (Page 100)

3-6 Signal Descriptions
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
3.3.2 Address and Data Signals
Table 3.3 describes the Address and Data Signals group.
Table 3.3 Address and Data Signals
Name Bump Type Strength Description
AD[63:0] W22, AB25, AC26,
AA25, W23, Y25, Y26,
V22, U22, V24, V23,
U24, V25, W26, U23,
U25, T22, T23, T25,
R25, R22, P22, P23,
R23, P24, P25, T26,
R26, M26, L26, N25,
N24, AE9, AF8, AE10,
AB11, AC11, AE11,
AE12, AB12, AC12,
AD13, AE13, AF11,
AF16, AE14, AC15,
AC14, AD17, AE19,
AC18, AB17, AB18,
AF20, AE20, AC19,
AF23, AE22, AB19,
AD21, AF24, AC20,
AE23, AC21 T/S 8 mA PCI Physical longword Address and Data are
multiplexed on the same PCI pins. A bus
transaction consists of an address phase
followed by one or more data phases.
During the first clock of a transaction,
AD[63:0] contain a 64-bit physical byte
address. If the command is a dual address
cycle (DAC), implying a 64-bit address,
AD[31:0] contain the upper 32 bits of the
address during the second clock of the
transaction. During subsequent clocks,
AD[63:0] contain data. PCI supports both
read and write bursts. AD[7:0] define the
least significant byte, and AD[63:56] define
the most significant byte.
C_BE[7:0]/ AA23, AC25, Y23,
AD26, AB13, AB14,
AE18, AE21 T/S 8 mA PCI Bus Command and Byte Enables are
multiplexed on the same PCI pins. During
the address phase of a transaction,
C_BE[3:0]/ define the bus command. If the
transaction is a DAC, C_BE[3:0]/ contain the
DAC command and C_BE[7:4]/ define the
bus command. C_BE[3:0]/ define the bus
command during the second clock of the
transaction. During the data phase,
C_BE[7:0]/ are used as byte enables. The
byte enables determine which byte lanes
carry meaningful data: C_BE[0]/ applies to
byte 0 and C_BE[7] applies to byte 7.
PAR AF19 T/S 8 mA PCI Parity is the even parity bit that protects the
AD[31:0] and C_BE[3:0]/ lines. During the
address phase, both the address and
command bits are covered. During the data
phase, both the data and byte enables are
covered.