at75c220 ATMEL Corporation, at75c220 Datasheet - Page 19

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

SMC Register Map
The SMC is programmed using the registers listed in the
Table 8. The memory control register (SMC_MCR) is used
to program the number of active chip selects and data read
protocol. Four chip select registers (SMC_CSR0 to
SMC_CSR3) are used to program the parameters for the
Table 8. SMC Register Map
SMC Chip Select Register
Register Name:SMC_CSR0..SMC_CSR3
Access:
Reset Value:
•
Offset
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
0x20
0x24
DBW: Data Bus Width
PAGES
0
0
1
1
31
23
15
7
–
DBW
Read/write
Register Name
SMC_CSR0
SMC_CSR1
SMC_CSR2
SMC_CSR3
SMC_MCR
0
1
0
1
MWS
–
–
–
–
–
30
22
14
6
–
Data Bus Width
Reserved
16-bit external bus
32-bit external bus
Reserved
BA
Description
Chip Select Register
Chip Select Register
Chip Select Register
Chip Select Register
Reserved
Reserved
Reserved
Reserved
Reserved
Memory Control Register
CSEN
WSE
29
21
13
5
BAT
28
20
12
4
BA
individual external memories. Each SMC_CSR must be
programmed with a different base address, even for
unused chip selects. The AT75C220 resets such that
SMC_CSR0 is configured as having a 16-bit data bus.
NWS
27
19
11
3
–
Read/ write
TDF
Read/write
Read/write
Read/write
Read/write
26
18
10
2
–
Access
–
–
–
–
–
25
17
9
1
–
Reset Value
0x0000203D
0x10000000
0x20000000
0x30000000
DBW
–
–
–
–
–
0
PAGES
LCD
24
16
8
0
19