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3. TECHNICAL BRIEF
3.13 Memory Interface
In E-GOLDvoice, the 16bits demultiplex X-bus interface is used for memory device support. NOR
Flash memory is supported. (The NAND Flash memory is not supported). The page mode can be
supported for flash memories. Up to 8MBytes of external RAM and/or ROM can be connected to the
MCU via its external bus interface.
Up to 3 external CS signals can be generated to save external glue logic. Access to very slow
memories is supported via a special ‘Ready’ function. The system MCU clock is set to run with 26Mhz.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3-13 Memory interface
MEMORY
F_CS
DNI
R139
G4
VCCF
VCCS
G5
G8
VSS1
E2
VSS2
A4
WP_ACC
_CE1F
F1
_CE1S
G1
_LB
A3
_OE
F2
_RSTF
B4
B3
_UB
_WE
A5
H7
DQ14
DQ15
F7
DQ2
H3
DQ3
F4
F5
DQ4
H6
DQ5
E6
DQ6
DQ7
G7
H2
DQ8
F3
DQ9
RFU0
C8
D8
RFU1
RFU2
E7
F8
RFU3
RFU4
H5
C4
RY__BY
C1
A2
A20
C5
A3
B1
D2
A4
C2
A5
B2
A6
A7
A2
A6
A8
C6
A9
B5
CE2S
DQ0
G2
DQ1
E3
G3
DQ10
H4
DQ11
DQ12
G6
F6
DQ13
A0
E1
A1
D1
D6
A10
A11
A7
B7
A12
A13
C7
D7
A14
A15
B8
A16
E8
A17
D3
A18
C3
A19
B6
S71GL032N40BFW0P
U104
100K
R137
100K
R138
_WR
BHE_N
2V8_VMEM
_RY_BY
2V8_VMEM
2V8_VMEM
_OE
C145
0.1u
0.1u
C144
ADD22
ADD20
ADD03
ADD21
ADD04
ADD05
ADD06
ADD07
ADD08
ADD09
ADD10
_OE
_WR
DATA06
DATA07
DATA08
DATA09
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
ADD01
ADD02
ADD11
ADD12
ADD13
ADD14
ADD15
ADD16
ADD17
ADD18
ADD19
_FLASH_CS
_RAM_CS
ADD00
BHE_N
DATA00
DATA01
DATA02
DATA03
DATA04
DATA05