Canon BJC-55 Series, Service Manual

Page: 69 / 206

9) Timing
2-19
BJC-50
Part 2: Product Specifications
BUSY
ACKNLG
3.5
µ
s min.
1.0
µ
s
min
DATA 1-8
STROBE
1.0
µ
s
min
1.0
µ
s
min
Figure 2-12 Timing Chart (Compatibility Mode)
H
P
H
H
P
P
P
P
Printer status is busy
0000 0000
Data bit 2
1284 Active
(SELECT IN)
AckDataReq
(PE)
Data (1 - 8)
HostBusy
(AUTO FEED XT)
HostClk
(STROBE)
PtrClk
(ACKNLG)
PtrBusy
(BUSY)
nDataAvail
(ERROR)
XFlag
(SELECT)
TP TP TP
TP: minimum setup time
TP
TP
Data bit 6
TP
TP
Data bit 3
Data bit 0
Data bit 1 Data bit 5
Data bit 4
Data bit 7
Nibble mode
supporting
Not transferable
0001 0000
1284 Active
(SELECT IN)
Data (1 - 8)
HostAck
(AUTO FEED XT)
HostClk
(STROBE)
PeriphClk
(ACKNLG)
XFlag
(SELECT)
PeriphAck
(BUSY)
nPeriphRequest
(ERROR)
Byte0 Byte1
nCmd nCmd
ECP Mode Supported
nAckReverse
(PE)
H
P
nReverseRequest
(INIT)
TP
H
H
P
P
P
P
P
P
Perror
Busy
Error
Select
nPeriphRequest
TP: minimum setup time
TP
TP
TP
TP TP
Figure 2-13 Timing Chart (Nibble Mode)
Figure 2-14 Timing Chart (ECP Mode)