PC8260 データシートの表示（PDF） - Atmel Corporation

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PC8260

PowerPC-based Communications Processors

Atmel Corporation 

PC8260 PowerQUICC II

Table 4. External Signals (Continued)

Pin

Signal Name

LWE[0:3]

LSDDQM[0:3]

LBS[0:3]

Local Bus Write Enable

Local Bus SDRAM DQM

Local Bus UPM byte select

LSDA10

LGPL0

LSDWE

LGPL1

LOE

LSDRAS

LGPL2

LSDCAS

LGPL3

LGTA

LUPWAIT

LGPL4

LPBS

LGPL5

LWR

Local Bus SDRAM A10

Local Bus UPM General

Purpose Line 0

Local Bus SDRAM Write

Enable

Local Bus UPM General

Purpose Line 1

Local Bus Output Enable

Local Bus SDRAM RAS

Local bus UPM General

Purpose Line 2

Local Bus SDRAM CAS

Local Bus UPM General

Purpose Line 3

Local Bus GPCM TA

Local Bus UPM Wait

Local Bus UPM General

Purpose Line 4

Local Bus Parity Byte

Select

Local Bus UPM General

Purpose Line 5

Local Write

Type

O

O

O

O

O

O

O

O

O

O

O

O

I

I

O

O

O

O

Description

The write enable pins are outputs of the Local bus GPCM. These pins

select specific byte lanes for write operations.

The DQM pins are outputs of the SDRAM control machine. These pins

select specific byte lanes of SDRAM devices.

The byte select pins are outputs of the UPM in the memory controller.

They are used to select specific byte lanes during memory operations.

The timing of these pins is programmed in the UPM. The actual driven

value depends on the address and size of the transaction and the port

size of the accessed device.

Output from the 60x bus SDRAM controller. This pin is part of the

address when a row address is driven and is part of the command when

a column address is driven.

This is one of six general purpose output lines from the UPM. The values

and timing of this pin are programmed in the UPM.

Output from the local bus SDRAM controller. This pin should be

connected to SDRAM’s WE input.

This is one of six general purpose output lines from the UPM. The values

and timing of this pin are programmed in the UPM.

The output enable pin is an output of the Local bus GPCM. This pin

controls the output buffer of memory devices during read operations.

Output from the Local bus SDRAM controller. This pin should be

connected to the SDRAM RAS input.

This is one of six general purpose output lines from UPM. The values

and timing of this pin are programmed in the UPM.

Output from the Local bus SDRAM controller. This pin should be

connected to SDRAM’s CAS input.

This is one of six general purpose output lines from the UPM. The values

and timing of this pin are programmed in the UPM.

This input pin is used for transaction termination during GPCM

operation. This pin requires an external pull up resistor for proper

operation.

This is an input to the UPM. An external device may hold this pin low to

force the UPM to wait until the device is ready for the continuation of the

operation.

This is one of six general purpose output lines from UPM. The values

and timing of this pin is programmed in the UPM.

In systems in which the data parity is stored in a separate chip, this

output is used as the byte select for that chip.

This is one of six general purpose output lines from the UPM. The values

and timing of this pin are programmed in the UPM.

The local write pin is an output from the local bus memory controller. It is

used to distinguish between read and write transactions.

27

2131B–HIREL–02/03

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