IMS C011

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12

5

Mode 1 parallel interface

In Mode 1 the IMS C011 link adaptor is configured as a parallel peripheral interface with handshake lines.

Communication with a transputer family device is via the serial link. The parallel interface comprises an

input port and an output port, both with handshake.

5.1

Input port

The eight bit parallel input port I0-7 can be read by a transputer family device via the serial link. IValid and

IAck provide a simple two-wire handshake for this port. When data is valid on I0-7, IValid is taken high

by the peripheral device to commence the handshake. The link adaptor transmits data presented on I0-7

out through the serial link. After the data byte transmission has been completed and an acknowledge pack-

et is received on the input link, the IMS C011 sets IAck high. To complete the handshake, the peripheral

device must return IValid low. The link adaptor will then set IAck low. New data should not be put onto

I0-7 until IAck is returned low.

Symbol

Parameter

Min

Nom

Max

Units

Notes

TIdVIvH

Data setup

5

ns

TIvHLdV

IValid high to link data output

0.8

2.5

bits

1,2

TLaVIaH

Link acknowledge start to IAck high

3.5

bits

1,3

TIaHIdX

Data hold after IAck high

0

ns

TIaHIvL

IValid hold after IAck high

0

ns

TIvLIaL

IAck hold after IValid low

0.8

3

bits

1

TIaLIvH

Delay before next IValid high

0

ns

Notes

1 Unit of measurement is one link data bit time; at 10 Mbits/s data link speed, one bit time is nomi-

nally 100 ns.

2 Maximum time assumes there is no acknowledge packet already on the link. Maximum time with

acknowledge on the link is extended by 2 bits.

3 Both data transmission and the returned acknowledge must be completed before IAck can go

high.

Table 5.1

Mode 1 parallel data input

Ack

Data

TIdVIvH

TIvLIaL

TIvHLdV

LinkOut

I0–7

LinkIn

TLaVIaH

IValid

IAck

TIaHIvL

TIaLIvH

TIaHIdX

Figure 5.1

IMS C011 Mode 1 parallel data input to link adaptor