AT75C220 Datasheet, PDF (12/144 Pages) ATMEL Corporation – Smart Internet Appliance Processor(SIAP)

AT75C220 Mode Controller
The ARM configures the mode of the AT75C220 by means
of the SIAP-E mode controller.
The SIAP-E mode controller is a memory-mapped periph-
eral that sits on the APB bus.
Register Map
Base Address: 0xFF000000
Table 5. AT75C220 Register Map
Register Address
Register Name
Description
Access
Reset Value
0x0
SIAP_MD
SIAP-E Mode Register Read/write
0x00B0340
0x4
SIAP_ID
SIAP-E ID Register
Read-only
0x0000220⁽¹⁾
0x8
SIAP_RST
SIAP-E Reset Status
Read/write
0x0000001
Register
0xC
Note:
SIAP_CLKF
SIAP-E Clock Status
Register
Read-only
0x0000001
1. If the PKG flag is set, the reset value is 0x00010220 since the AT75C220 is bonded in large bond-out mode.
SIAP-E Mode Register
Register Name: SIAP_MD
Access: Read/write
Reset Value: 0x00B0342
31
30
29
28
27
26
25
24
–
–
JCIDBG
OUTDIV
INDIV
23
22
21
20
19
18
17
16
ICP
IPOLTST
15
14
13
12
11
10
9
8
–
CRA
–
DBA
SW2
SW1
LPCS
7
6
5
4
3
2
1
0
SA
LP
–
–
IA
–
RA
RM
• RM: Remap
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.
• RA: OAKA Reset
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.
• IA: Inhibit OAKA Clock
This flag resets to active low so that the OAKA clock is enabled. The OAKA clock is be inhibited by asserting this flag
high.
• LP: Low Power Mode
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.
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AT75C220