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SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
(Termination mode)
HOST
/SELECTIN
Low
/AUTOFD
Low
/INIT
Compatibility status
/AUTOFD
HIgh
Signal description (Parallel I/F)
The 1284 mode signals are described below. The name in ( ) shows
the name in the capability mode.
Host Clk/nWrite (nStroke): Driven by the host.
Capability Mode:
Set to active LOW in order to transfer data
to the input latch of peripheral devices.
The data are valid when nStrobe is LOW.
Negotiation phase:
Set the active LOW in order to transfer the
extensibility request value to the input
latch of peripheral devices. The data are
valid at the falling edge of HostClk.
Reverse data transfer
Set to HIGH during transition to the Nibble
phase:
Mode in order not to latch data to the
peripheral devices. To confirm data trans-
fer from peripheral devices, it is set to
LOW pulse during Byte Mode transfer.
The peripheral devices must confirm that
new data byte is not transferred to the
input latch of the peripheral devices by
this pulse.
ECP Mode:
To transfer data or address information
from the host to the peripheral devices,
PeriphAck (Busy) is used in the closed
loop handshake.
EPP Mode:
Set to LOW in order to show write opera-
tion of address or data to peripheral
devices.
Set to HIGH in order to show read opera-
tion of address or data from peripheral
devices.
PRINTER
Evalid
On
BUSY
High
/FAULT
High
/INTR
Low
Interrupt
Clr
DELAY
On
/ACK
Low
SELECT
Low
/INTR
Low
PE
Compatibility status
/FAULT
Compatibility status
SELECT
Compatibility status
Interrupt
Clr
DELAY
On
/ACK
High
AD1 – AD8 (Data 1 – Data 8): Driven by the host in the Compatibility
Mode and negotiation phase. (Not used in the Nibble Mode. Bi-direc-
tional in the other modes.)
All modes: Data 1 is the lowest bit (Bit 0). Data 8 is the highest bit (Bit
7).
Compatibility Mode:
Negotiation phase:
Reverse data transfer
phase:
EPC mode:
EPP mode:
PtrClk/PeriphClk/Intr(nAck): Driven by the peripheral devices.
Compatibility Mode:
Negotiation phase:
Reverse data transfer/
phase:
13 – 26
ON when termination is effective.
PE, BUSY, and /Fault are set with software.
PE, BUSY, and /Fault are set with software.
Forward channel data
Extensibility request value
Nibble Mode: Not used. (The host con-
tinues to drive the bus.)
Byte mode:
Reverse channel data
Address or data transfer from the host to
the
peripheral
peripheral device to the host.
Address or data transfer from the host to
the
peripheral
peripheral device to the host.
Set to LOW pulse by the peripheral device
to confirm transfer of the data byte from
the host.
Set to LOW to confirm the 1284 support.
Then set to HIGH to show that Xflag
(Select) and data flags can be read.
Used in either mode of Nibble and Byte to
identify (qualify) the data which are under
transmission to the host.
0~35ms
min0.5µs
0~1s
min0.5µs
0~1s
device
or
from
the
device
or
from
the
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