at75c220 ATMEL Corporation, at75c220 Datasheet - Page 12

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

AT75C220 Mode Controller
The ARM configures the mode of the AT75C220 by means
of the SIAP-E mode controller.
Register Map
Base Address: 0xFF000000
Table 5. AT75C220 Register Map
Note:
SIAP-E Mode Register
Register Name: SIAP_MD
Access: Read/write
Reset Value: 0x00B0342
•
•
•
•
12
Register Address
0x0
0x4
0x8
0xC
RM: Remap
RA: OAKA Reset
IA: Inhibit OAKA Clock
LP: Low Power Mode
On reset being released this flag is set to the value of NDSRA/BOOTN. When RM is active low the Boot ROM is
mapped to location 0x00000000. Subsequently, this flag can be set high by software so that the ROM mapping is dis-
abled and another memory controller region (e.g. FLASH) is mapped to location 0x00000000.
This flag resets to active low so that the OAKA is held in reset. The OAKA is be released from reset by asserting this
flag high.
This flag resets to active low so that the OAKA clock is enabled. The OAKA clock is be inhibited by asserting this flag
high.
On reset this field is high. When written high the PLL is disabled and the ARM and OAK cores and logic are clocked at
the low power clock frequency. Note, in this mode the ARM and OAK are clocked at the same frequency determined by
the LPCS field. When LP is written low the PLL is enabled and once it has locked the clock is switched over to the nor-
mal operating frequency.
31
23
15
SA
7
–
–
1. If the PKG flag is set, the reset value is 0x00010220 since the AT75C220 is bonded in large bond-out mode.
CRA
30
22
14
LP
6
–
AT75C220
Register Name
SIAP_MD
SIAP_ID
SIAP_RST
SIAP_CLKF
ICP
29
21
13
5
–
–
JCIDBG
Description
SIAP-E Mode Register
SIAP-E ID Register
SIAP-E Reset Status
Register
SIAP-E Clock Status
Register
DBA
28
20
12
4
–
The SIAP-E mode controller is a memory-mapped periph-
eral that sits on the APB bus.
SW2
27
19
11
3
IA
OUTDIV
Access
Read/write
Read-only
Read/write
Read-only
SW1
26
18
10
2
–
IPOLTST
25
17
RA
9
1
Reset Value
0x00B0340
0x0000220
0x0000001
0x0000001
INDIV
LPCS
(1)
RM
24
16
8
0