IMSC011 データシートの表示（PDF） - STMicroelectronics

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IMSC011

Link adaptor

STMicroelectronics 

5 Mode 1 parallel interface

5.2 Output port

The eight bit parallel output port Q0-7 can be controlled by a transputer family device via the serial link.

QValid and QAck provide a simple two-wire handshake for this port.

A data packet received on the input link is presented on Q0-7; the link adaptor then takes QValid high to

initiate the handshake. After reading data from Q0-7, the peripheral device sets QAck high. The IMS C011

will then send an acknowledge packet out of the serial link to indicate a completed transaction and set

QValid low to complete the handshake.

Symbol

TLdVQvH

TQdVQvH

TQvHQaH

TQaHQvL

TQaHLaV

TQvLQaL

TQvLQdX

Parameter

Start of link data to QValid

Data setup

QAck setup time from QValid high

QAck high to QValid low

QAck high to Ack on link

QAck hold after QValid low

Data hold

Min Nom Max Units Notes

11.5

bits

1

12

ns

2

0

ns

1.8

bits

1

0.8

2.5

bits

1,3

0

ns

11

bits

1,4

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 Where an existing data output bit is re-written with the same level there will be no glitch in the

output level.

3 Maximum time assumes there is no data packet already on the link. Maximum time with data on

the link is extended by 11 bits.

4 Data output remains valid until overwritten by new data.

Table 5.2 Mode 1 parallel data output

LinkIn

Q0–7

QValid

QAck

LinkOut

Data

Data

TLdVQvH

TQdVQvH

TQvLQdX

TQvHQaH

TQaHQvL

TQvLQaL

TQaHLaV

Ack

Figure 5.2 IMS C011 Mode 1 parallel data output from link adaptor

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