Canon BJC-6000 Technical Information PDF herunterladen (Seite 45)

Host Ack (Input)

When data is to be sent from the host computer to the printer, this signal is used

to tell whether the data the host computer has output on the data bus is command

or data ("L" means command and "H," data). In the reverse data transmission

phase, this signal and Periph Clk perform handshaking. The host computer notifies

the printer that it is ready to receive data by making this signal "L," and makes this

signal "H" to notify that it has received the data.

Reverse Req (Input)

The host computer makes this signal "L" during a recovery process (re-sending

data) in the forward data transmission phase. This signal goes "H" in response to

the falling edge of Ack Reverse. The host computer also makes this signal "L" to

notify the printer that the forward data transmission idle phase is to change to the

reverse data transmission phase (data is to be sent from the printer to the host

computer).

Periph Req (Output)

The printer makes this signal "L" to ask the host computer to change the forward

data transmission phase to the reverse data transmission phase. When the host

computer notifies the printer that the forward data transmission phase is to

change to the reverse data transmission phase by making Reverse Req "L," the

printer acknowledges by making both this signal and Ack Reverse "H."

1284 Active (Input)

This signal goes "H" at the start of negotiation and is always "H" in ECP mode to

indicate that bi-directional operation is in effect. When ECP mode is to be

terminated, this signal goes "L" and termination phase is entered.

9) Timing charts

2-15

BJC-6000

Part 2: Product Specifications

BUSY

ACKNLG

DATA 1 to 8

STROBE

Min. Min. Min.

s or 0.9

0.5

s 0.5

Figure 2-9 Timing Chart (Compatible mode)

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 173 174

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Canon BJC-6000 Technical Information Seite 45