Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 314

Main PCB Circuit Diagram (6/6)
1 2
TOPOLOGY
(a)SDRAM
Pin name SDCLK0
Main
ASIC 100MHz
Buffer Type TDBIADIMNN**
DIMM Buffer R R
A (SL4C=13mA) 0 0
(1)1BANK of X16 SDRAM
2BANK of X16 SDRAM
Pin name SDCLK1
SDCLK2
Main
Buffer Type ASIC 100MHz
TDBIADIMNN**
DIMM Buffer
R
(SL4C=17mA)
10
(2)2BANK of X8 SDRAM
Main
ASIC 100MHz
R
10
B
(1)DIMM NOT INSTALLED
Pin name MA[12-0] DIMM INSTALLED SDRAM
BA[1-0]
SDRASN
SDCASN Main
SDWEN ASIC 50MHz
Buffer Type TDOPAC33NN18 R
Output Buffer (3.3V) 18mA
33
(SL4C=24mA)
(2)1BANK of X16 SDRAM SDRAM
Main
ASIC 50MHz
R
33
C
(3)2BANK of X16 SDRAM
SDRAM
Main
ASIC 50MHz
R
33
(4)2BANK of X8 SDRAM
D
SDRAM
Main
ASIC 50MHz
R
33
E
(1)DIMM NOT INSTALLED
DIMM INSTALLED
Pin name DQM[7-0] Main
SDRAM
ASIC 50MHz
Buffer Type TDOPAC33NN12
R R
Output Buffer (3.3V) 12mA
22
(SL4C=12mA)
(2)1BANK of X16 SDRAM
Main
SDRAM
ASIC 50MHz
R
22
(3)2BANK of X16 SDRAM
2BANK of X8 SDRAM
Main
SDRAM
ASIC 50MHz
F
R
22
1 2
3 4
SDRAM
Pin name SDCSN0
Main
Buffer Type TDOPAC33NN12
ASIC 50MHz
Output Buffer (3.3V) 12mA
R
(SL4C=12mA)
33
DIMM (1)1BANK of X16 SDRAM
Pin name SDCSN1 2BANK of X16 SDRAM
(note)
SDCSN2
1bank :SDCLK2=NC
Main
Buffer Type TDOPAC33NN12 ASIC 50MHz
Output Buffer (3.3V) 12mA
R
(SL4C=12mA) 33
DIMM
(2)2BANK of X8 SDRAM
Main
ASIC 50MHz
R
33
Pin name SDCKE
Main
Buffer Type TDBIAC33NN09 ASIC
I/O Buffer (3.3V) 9mA
R R
22 (SL4C=09mA) 22
(1)DIMM NOT INSTALLED
DIMM INSTALLED
DIMM
Pin name DIMMD[63-0] Main
ASIC
50MHz
Buffer Type TDBIAC33UN12
I/O Buffer(3.3V)12mA, 50k Pull-up
R
33
R (SL4C=12mA)
22
(2)1BANK of X16 SDRAM
Main
ASIC
50MHz
DIMM
R
33
(3)2BANK of X16 SDRAM
2BANK of X8 SDRAM
Main
R
ASIC
50MHz
22
R
33
(b)Local BUS
DIMM
Pin name IORDN Main
IOWRN ASIC 33MHz
Buffer Type TDBIAC33NN03S
R
I/O Buffer (3.3V) Schmitt in 3mA
33
(SL4C=6mA)
Main
ASIC 33MHz
CSROMN0
Pin name
CSROMN1
R
EXCSN0
EXCSN1 0
Main
Buffer Type TDBIAC33NN03S
ASIC 33MHz
I/O Buffer (3.3V) Schmitt in 3mA
R
(SL4C=6mA)
0
R
Main
22 ASIC 33MHz
R
0
Main
ASIC 5MHz
Pin name ADR[24-1]
R
Buffer Type TDBIAC33NN03S
6mA 0
I/O Buffer (3.3V) Schmitt in 3mA
5MHz
(SL4C=6mA)
Main
ASIC
5MHz
Pin name DATA[15-0]
R
Buffer Type TDBIAC33UN03
75
0
I/O Buffer(3.3V)3mA, 50k Pull-up
DATA[7-0]
(SL4C=6mA)
DIMM
Main
ASIC
5MHz
R
R
75
0
DATA[15-8]
DIMM
R
Main
75 Pin name
EXINTN0
ASIC 5MHz
EXINTN1
EXINTN2
Buffer Type TDBIAC33NN03S
I/O Buffer (3.3V) Schmitt in 3mA
3 4
6-6
5 6
SDRAM
R
0
(c)CDCC I/F
DIMM Pin name CDCCCLK Main
ASIC
Buffer Type TDOPAC33NN03
Output Buffer (3.3V) 3mA
(SL4C:3mA)
Main
Pin name CDCC_DATA
ASIC
Buffer Type TDBIAC33UN03
I/O Buffer(3.3V)3mA, 50k Pull-up
(SL4C:3mA)
DIMM
Pin name Main
CDCC_INTn
CDCC_REQn ASIC
Buffer Type
TDBIAC33UN03
I/O Buffer(3.3V) 3mA, 50k Pull-up
SDRAM
R
0
R R
22 39
SDRAM
DIMM
R R R
22 39 10
SDRAM
DIMM
R R R
22 39 10
SDRAM
R
ROM0 ROM1 47 LAN
ROM0
ROM1
LAN
ROM0 ROM1 LAN
[24-1] [23-1] [7-1]
R
ROM0 ROM1
0
LAN
8mA
R
ROM0 ROM1
0
LAN
8mA
R
100 LAN:8mA
5 6
7 8
A
50MHz CDCC GA
R
22
CDCC GA
25MHz
R
33
CDCC GA
25MHz
R
33
B
C
D
E
F
CODE LM9444-001
NAME CIR B512246 (6/6)
7 8
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