SCD1284 datasheet(121/176 Pages) INTEL

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IEEE 1284-Compatible Parallel Interface Controller — CD1284

Datasheet

121

7.3.1.4

Format 4 — Channel Control Command

This command activates or deactivates the serial transmitter and/or receiver of the selected

channel, based on the values in bits 3 through 0. This command is issued when a channel is being

started for the first time. Once a channel is in use, it can be started and stopped using this

command. It is more efficient however, to use the appropriate SRER bit in the IER. Multiple

control commands can be issued at the same time; for example, both the transmitter and receiver

can be enabled by simultaneously setting both the XMT EN and RCV EN bits.

Issuing an enable/disable command does not affect any register programming of the selected

channel. It does however, affect the state of transmit flow-control. Issuing a disable or enable

command to a channel whose transmitter has been flow-controlled by a remote (see the TxIBE bit

in COR2), restarts transmission and clears the TxFloff bit (CCSR[2]). This ability is provided so

that the host can override remote-generated flow control.

Must be ‘1’.

4:3

Must be ‘0’.

2:0

These bits are encoded as:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Chan Ctl

XMT EN

XMT DIS

RCV EN

RCV DIS

Bit

Description

SSPC2

SSPC1

SSPC0

Encoding

Not used.

Send special character 1.

Send special character 2.

Send special character 3.

Send special character 4.

Not used.

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