Ieee1284; Rom - Brother DCP 8040 - B/W Laser - All-in-One Service Manual

CHAPTER 3 THEORY OF OPERATION
1.3.3

IEEE1284

Stores the data received from the PC into DRAM as controlled by the DMA controller. It is
applicable to both normal receiving and bi-directional communication (nibble mode, byte mode,
ECP mode).
74LVX161284, 3.3V
connector side
INITN
5D
SEINN
5D
HBUSY
5D
STBN
5D
CDCC_D[0]
CDCC_D[1]
CDCC_D[2]
CDCC_D[3]
CDCC_D[4]
CDCC_D[5]
CDCC_D[6]
CDCC_D[7]
CDCC_D[7-0]
3A
1.3.4

ROM

5.0V level shifter IC stores the pull-up resistance in signal wire at the
L PC Printer
H Printer PC
CDCC_DIR
2B
CDCC_HD
2B
0V
CDCC_D[7-0]
1C
CDCC_D[0]
CDCC_D[1]
CDCC_D[2]
CDCC_D[3]
CDCC_D[4]
CDCC_D[5]
CDCC_D[6]
CDCC_D[7]
U7
230 245
CDCCINITN CDCCACKN
229 244
CDCCSINN CDCCBUSY
228 243
CDCCHBUSY CDCCPEN
227 242
CDCCSTBN CDCCSLCT
241
CDCCFLTN
240
CDCC_D0
239
CDCC_D1 INITN_IN
238 CDC-.cir/2B
CDCC_D2 SELINN_IN
CDC-.cir/2B
235
CDCC_D3 HBUSY_IN
234 CDC-.cir/2B
CDCC_D4 STBN_IN
233 CDC-.cir/2B
CDCC_D5
232
CDCC_D6
231
CDCC_D7
Aurora
0V
U11
48 18
DIR VCC VDD3
1 7
HD VCC
34 31
GND VCC_CABLE VDD5
42
VCC_CABLE
10
GND 0V
15
GND
39
GND
8 41
D[0]
A1 B1
9 40
D[1]
A2 B2
11 38
D[2]
A3 B3
12 37
D[3]
A4 B4
13 36
D[4]
A5 B5
14 35
D[5]
A6 B6
16 33
D[6]
A7 B7
17 32
D[7]
A8 B8
2 47
A9 Y9
3 46
A10 Y10
4 45
A11 Y11
5 44
A12 Y12
6 43
A13 Y13
HBUSY_IN
29 20
C14 A14
28 21 SELINN_IN
C15 A15
27 22 INITN_IN
C16 A16
26 23 STBN_IN
C17 A17
19 30
PLHIN PLH TP998
24 25
HLH HLHIN
TP999
74LVX161284
0V
INITN
1B
SEINN
1B
HBUSY
1B
STBN
1B
Fig. 3-5
Fig. 3-6
3-4
0V
D[7-0]
CDC-.cir/3C
TP118
R113
33
TP119
CDC-.cir/1B R115
33
TP120
CDC-.cir/1B R119
33
TP121
CDC-.cir/1B
R131
33
CDC-.cir/1B
DA2 DA3
DF5A6.8FU
0V
D[7-0]
CDC-.cir/3A
TP122
D[0] RA6 33
1 8
D[1]
2 7
D[2]
6
3
D[3]
4 5
D[4] RA5
33
1 8
D[5]
2 7
D[6]
TP123 3 6
D[7]
5
4
DA4 DA5
DF5A6.8FU
0V
CN5
18
VDD5 +5V
16
0V
17
0V
19
0V
20
0V
21
0V
22
0V
23
0V
24
0V
25
0V
26
0V
27
0V
28
0V
29
0V
30
0V 0V
10
ACK
11
BUSY
12
PE
13
SELECT
32
FLT
14
ATFEED
36
SELIN
31
INPRIM
1
STB
ZD1
UDZS6.8B
DF5A6.8FU
2
DI1
3
DI2
4
DI3
5
DI4
6
DI5
7
DI6
8
DI7
9
DI8
15
NC NC
33
NC
NC
34
NC NC
35
NC NC
DF5A6.8FU
37
IF_FG FG
38
IF_FG2 FG