Monaco Technical Reference

Spectrum Signal Processing

DSP~LINK3 Interface

 

Table 10 DSP~LINK3 Data Transfer Operating Modes

 

Base

ASTRB_EN

 

Mode

Address

Bit

Description

 

 

 

 

Standard

0160 0000h

x

For slave boards that are similar to DSP~LINK1

Access

 

 

slave boards and operate with a fixed access

 

 

 

time.

 

 

 

 

Standard

0164 0000h

0

For DSP~LINK3 slave boards that have fast,

Fast

 

 

fixed access time. This memory space is

Access

 

 

shared with the Address Strobe Control

 

 

 

operating mode.

Address

0164 0000h

1

For slave boards that require more than the

Strobe

 

 

16 KWords of addressing provided by the

Control

 

 

standard DSP~LINK3 address lines. The bus

 

 

 

master uses the /ASTRB cycle to place the

 

 

 

page address onto the DSP~LINK3 data lines.

 

 

 

It determines which address page is accessed

 

 

 

on the slave board. This allows access to up to

 

 

 

214 address pages with each address page

 

 

 

having an address depth of 214. The /ASTRB

 

 

 

Cycle has the same timing as the Standard

 

 

 

Fast transfer cycle.

 

 

 

 

Ready

0168 0000h

x

For DSP~LINK3 slave boards that require

Control

 

 

variable length access times. /DSTRB is active

Access

 

 

until the slave asserts the DSP~LINK3 ready

 

 

 

signal (/RDY) to end the cycle.

5.2.Address Strobe Control Mode

The Address Strobe Control mode uses the same node A 64K address space as the Standard Fast Access mode. The Address Strobe Control mode is enabled for this space by setting bit D1, the ASTRB_EN bit, of the DSP~LINK3 register to “1”. This register is located at address 016D 8018h of node A. Standard Fast Access mode writes will now generate /ASTRB cycles. The DSP~LINK3 slave attached to the Monaco board should then latch the lower addresses.

30

Part Number 500-00191

 

Revision 2.00

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Spectrum Brands C6x VME64 manual Address Strobe Control Mode, Astrben