D950-CORE datasheet(78/89 Pages) STMICROELECTRONICS

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D950-Core

7.4.2 I/O interface

The terms input and output are related to the DMA controller, external is related to the AS-

DSP.

Referring to the D950-Core pin description, the interrupt controller I/O interface signals are of

different types:

On the D950-Core Side

•HOLD (hold request / output)

•

HOLDACK (hold acknowledge / input)

•

CLK (clock / input)

•

INCYCLE (clock / input)

On the Internal Memory Side

•

XA0/XA15 (Y address bus) with associated control signals (output):

XRD (read / output)

XWR (write / output)

XBS (bus strobe / output)

•

YA0/YA15 (Y address bus) and YD0/YD15 (Y data bus) with their associated

control signals (clock / input):

YRD (read / input/output)

YWR (write / input/output)

YBS (bus strobe / output)

•

IA0/IA15 (I address bus) with associated control signals (output):

IRD (read / output)

IWR (write / output)

IBS (bus strobe / output)

On the Interrupt Controller Side

•

DIT(3:0) (interrupt request / output)

•DIT_AND (common interrupt request / output)

On the External Side

•DMARQ(3:0) (request / one input per channel)

•

DMACK(3:0) (acknowledge / one output per channel)

•

DIP_ENA (DITi output enable / input)

•

RESET (reset / input)

•DTACK (cycle extension / input),

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