Memory I/F - Acer AL2021 Service Manual

+3.3V_DIG
R40
R43
R67
/OCM_WE
4 /OCM_WE
/OCM_RE
4 /OCM_RE
/OCM_CS
4 /ROM_CS
4 OCMADDR[0..19]
OCMDATA[0..7]
4 OCMDATA[0..7]
+3.3V_DIG
10K/6
10K/6
10K/6
GND
OCMADDR[0..19]
+3.3V_DIG
R68 10K/6
R69 10K/6
R70 10K/6
R62 10K/6
R55 10K/6
R47 10K/6
R50 10K/6
OCMADDR8
OCMADDR9
OCMADDR13
OCMADDR14
OCMADDR15
OCMADDR16 INT_OSC
OCMADDR18
8-BIT_FLASH2
OCMADDR17 8-BIT_FLASH1
R65 10K/6
OCMADDR19 8-BIT_FLASH3
R80 10K/6
OCMADDR10 TCLK
R41 10K/6
OCMADDR11 OUTPUTS_ZERO
R46 10K/6
OCMADDR12 OUTPUTS_ZERO
R71 10K/6
Socket for a X8 Flash (64/128/256/512K) and
PROMJETmemory Emulator
XU1
OCMADDR18 1
A18
OCMADDR17 30
A17
OCMADDR16 2
A16
OCMADDR15
3
A15
OCMADDR14
29
A14
OCMADDR13
28
A13
OCMADDR12
4
A12
OCMADDR11
25
A11
OCMADDR10
23
A10
OCMADDR9
26
A9
OCMADDR8
27
A8
OCMADDR7
5
A7
OCMADDR6 6
A6
OCMADDR5 7
A5
OCMADDR4 8
A4
OCMADDR3
9
A3
OCMADDR2
10
A2
OCMADDR1
11
A1
OCMADDR0
12
A0
A28F001
29LV040B
Firmware_Bypass R56 10K/6
DDC2BI R51 10K/6
Serial_Interface_Debug1 R61 10K/6
Serial_Interface_Debug2 R64 10K/6
Serial_Interface_Debug3 R73 10K/6
GND
GND
- 45 -
21 OCMDATA7
DQ7
20 OCMDATA6
DQ6
19 OCMDATA5
DQ5
OCMDATA4
18
DQ4
OCMDATA3
17
DQ3
OCMDATA2
15
DQ2
OCMDATA1
14
DQ1
OCMDATA0
13
DQ0
/ROM_CS
22
CE#
/OCM_RE
24
OE#
31 /OCM_WE
WE#
+3.3V_DIG
32
VCC
16
VSS
GND
10: LOW (Use TCLK)
11: LOW (set all display output to '0')
12: LOW
13: LOW(disable serial interface debug)
14: LOW
15: LOW
16: HIGH (use crystal)
17: LOW (8bit bus with OCM access external ROM)
18: HIGH
19: LOW
PROJECT : L0T
Quanta Computer Inc.
Title

06. Memory I/F

Size Document Number
06. Memory I/F
Date: Friday, July 11, 2003
Rev
1A
L0T
Sheet 6 of 8