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S5320 – PCI Match Maker: Signal Description

Revision 5.03 – June 14, 2006

AMCC Confidential and Proprietary

DS1656

Data Sheet

ADD-ON BUS AND S5320 CONTROL SIGNALS

The following sets of signals represent the interface signals available for the user Add-On bus and S5320 control.

Table 5. Serial nvRAM Interface Signals

Signal

Type

Description

SCL

o/d-out

Serial Clock. This clock provides timing for all transactions on the two-wire serial bus. The S5320 drives

this signal when performing as a serial bus master. SCL operates at the maximum allowable clock

speed and enters the high Z state when FLT# is asserted or the serial bus is inactive.

SDA

o/d

Serial Data/Address. This bi-directional signal carries serial address and data information between

nvRAMs and the S5320. This pin enters high Z state when FLT# is asserted or the serial bus is inactive.

Table 6. Direct Mailbox Access Signals

Signal

Type

Description

MDMODE

Mailbox Data Mode. The MD[7:0] signal pins are always inputs when this signal is high. The MD[7:0]

signal pins are defined as inputs and outputs under LOAD# control when MDMODE is low. This pin is

provided for software compatibility with the S5335. New designs should permanently connect this sig-

nal low. This signal is connected to an internal 50k Ohm pull-up.

LOAD#

MD[7:0] is defined as an input bus when this signal is low. The next rising edge of the ADCLK will latch

MD[7:0] data into byte three of the Add-On outgoing mailbox. When LOAD# is high and MDMODE is

low, MD[7:0] are defined as outputs displaying byte three of the PCI outgoing mailbox. This signal is

connected to an internal 50k Ohm pull-up.

MD[7:0]

t/s

Mailbox Data bus. The mailbox data registers can be directly accessed using the LOAD# and

MDMODE signals. When configured as an input, data byte three of the PCI incoming mailbox is directly

written to from these pins. When configured as an output, data byte three of the PCI outgoing mailbox

is output to these pins. All MD[7:0] signals have an internal 50k Ohm pull-up.

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