A
Technical Specifications
A-13
Cardinal U/G
Rev. C
A5 size APPA.FM
11/6/98 Pass 0
R
Proof Sign-off:
Kimura _______
Nishi _______
Hoadley _______
nInit/nReverseRequest
nFault/DataAvail/nPeriphRequest
Compatibility mode: When a low signal is detected, the printer is
deemed to be BUSY until the low signal is
released.
Negotiation phase: Always high.
Reverse data transfer
phase:
Always high.
ECP mode: Low when switching to reverse direction.
The peripheral device has permission to
drive the data signal only when this signal is
low and 1284active is high.
Compatibility mode: Low signal indicates that an error occurred.
Negotiation phase: This signal is set high in order to authorize
1284 compatibility. In nibble mode, after the
host sets HostBusy (nAutoFd) high, this
signal is set low in order to indicate that the
transmission data is ready.
Reverse data transfer
phase:
This signal is set low in order to indicate to a
nibble mode host that the transmission data
is ready. Afterwards, this signal serves as
nibble data bit 0 and then 4.
Reverse final phase: Indicates whether or not the data is valid.
ECP mode: This signal is set low to request
communications with the host. Valid in both
forward and reverse direction.
