
84
Agere Systems Inc.
T8302 Internet Protocol Telephone
Advanced RISC Machine (
ARM
)
Data Sheet
July 2001
8 External Memory Interface (EMI)
(continued)
8.5 EMI FLASH Registers
The EMI FLASH has registers to configure the base address and other options for each of the chip selects
FLASH_CS
,
CS1
,
CS2
, and
CS3
, the base address for the internal SRAM, a
status register
that records all sys-
tem bus errors, and an
options register
common to all chip selects (
FLASH_CS
,
CS1
,
CS2
, and
CS3
).
8.5.1 Chip Select Configuration Register FLASH_CS
FLASH_CS is active-low.
Table 58. Chip Select Configuration Register FLASH_CS
Table 57. EMI FLASH Register Map
Register
Address
0xE000 3000
0xE000 3004
0xE000 3008
0xE000 300C
Chip select configuration register FLASH_CS
(see Table 58 on page 84)
.
Chip select configuration register CS1
(see Table 59 on page 85)
.
Chip select configuration register CS2
(see Table 59 on page 85)
.
Chip select configuration register CS3
(see Table 59 on page 85)
.
Reserved.
Chip select base address register FLASH_CS
(see Table 62 on page 87)
.
Chip select base address register CS1
(see Table 62 on page 87)
.
Chip select base address register CS2
(see Table 62 on page 87)
.
Chip select base address register CS3
(see Table 62 on page 87)
.
Chip select internal SRAM base address register
(see Table 62 on page 87)
.
Reserved.
Status register
(see Table 64 on page 88)
.
Options register
(see Table 65 on page 89)
.
0xE000 3010:0xE000 301C
0xE000 3020
0xE000 3024
0xE000 3028
0xE000 302C
0xE000 3030
0xE000 3034:0xE000 307C
0xE000 3040
0xE000 3044
Address 0xE000 3000
11
10
RSVD
HD
Bit #
Name
Bit #
31:14
13
31:14
RSVD
Name
RSVD
UBE
13
UBE
12
9
8
7
6
5:4
HS
3:0
WS
REMAP
RSVD
Description
WT
SET
RSVD
Reserved.
Use byte enables. Used for devices which are 16-bit devices and use byte enables. Byte
writes to these devices are illegal if this bit is not set.
If 1, byte enables are used by the device.
If 0, no byte enables are used by the device.
REMAP ROM/RAM remap. Remap ROM to the base address in
chip select base address register
(FLASH_CS)
.
12
If
REMAP
= 1,
FLASH_CS
goes active only at the base address in the
chip select base
register
FLASH_CS
(see Table 62 on page 87)
.
If
REMAP
= 0, FLASH_CS goes active at address 0x0 as well as at the base address in the
chip select base register
FLASH_CS
.
Reset value = 0.
Reserved.
11
RSVD