PCI9060ES datasheet(103/192 Pages) ETC

103 / 192 page

SECTION 5

PCI 9080

PIN DESCRIPTION

©PLX Technology, Inc., 1997

Page 94

Version 1.02

5.3 C BUS MODE PIN OUT

Table 5-6. C Bus Mode Interface Pin Description

C Mode Bus

Symbol

Signal Name

Total

Pins

Type

Number

Function

ADS#

Address Strobe

I/O

12 mA

154

Indicates a valid address and the start of a new bus access. Asserted

for the first clock of a bus access.

BLAST#

Burst Last

I/O

8 mA

155

Signal driven by the current local bus master to indicate the last

transfer in a bus access.

BTERM#

Burst Terminate

146

For processors that burst up to four Lwords. If Bterm is disabled

through the PCI 9080 configuration registers, PCI 9080 also bursts

up to four Lwords. If enabled, PCI 9080 continues to burst until a

BTERM# input is asserted. BTERM# is a ready input that breaks up

a burst cycle and causes another address cycle to occur. Used in

conjunction with the PCI 9080 programmable wait state generator.

DEN#

Data Enable

12 mA

145

Used in conjunction with DT/R# to provide control for data

transceivers attached to the local bus.

DT/R#

Data

Transmit/Receive

12 mA

138

Used in conjunction with DEN# to provide control for data transceivers

attached to the local bus. When asserted, the signal indicates the PCI

9080 receives data.

LW/R#

Write/Read

I/O

12 mA

137

Asserted low for reads and high for writes.

LLOCK#

Bus Lock

153

Indicates an atomic operation that may require multiple transactions

to complete. Used by the PCI 9080 for direct local access to the PCI

bus.

LA[31:2]

Address Bus

I/O

8 mA

136, 135,

133-125,

122-115,

113-106,

103-101

Carries the upper 30 bits of the physical address bus. During bursts,

LA[31:2] increment to indicate successive data cycles.

LD[31:0]

Data Bus

I/O

8 mA

177-182,

185-192,

194-207, 2-5

Carries 32, 16, or 8 bit data quantities depending on bus width

configuration.

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