Brother HL-1040, HL-820, HL-1020 manual One output port and one I/O port are assigned II-13

CPU Receive Mode

STROBE

BUSY

ACK

90 µsec 0.5 µsec

DMA Receive Mode

STROBE

BUSY

ACK

1.5 µsec 0.5 µsec

BUSY goes HIGH at the falling edge of the STROBE signal. The data (8 bits) from the PC is latched into the data buffer at the rising edge of the STROBE signal. The pulse width of ACK varies according to the speed MODE as shown above. BUSY goes LOW on the rising edge of ACK.

<IEEE1284 support>

This supports the IEEE1284 data transfer with the following mode.

Nibble mode

Byte mode

ECP mode

(8)Data expansion

This circuit expands the compressed image data received from the PC, and writes the bit map data to the FIFO.

(9)Software support

Supports 16 x 16 rotation, bit expansion, bit search, and decimal point conversion.

(10)EEPROM I/O

One output port and one I/O port are assigned.

II-13