cx82100 Conexant Systems, Inc., cx82100 Datasheet - Page 98

• Manufacturer Part Number: cx82100
• Description: Home Network Processor Hnp
• Manufacturer: Conexant Systems, Inc.

6.12
Table 6-7. EMC Register
6.12.1
6-8
EMCR
Bit(s)
7:6
5:4
3:2
1:0
Register Label
Type
RW
RW
RW
RW
EMC Register
External Memory Control Register (EMCR: 0x00350010)
Default
2’b00
2’b00
2’b00
2’b00
Conexant Proprietary and Confidential Information
External Memory Control Register
The EMC register is identified in Table 6-7.
Name
SRWSC
SRCSEL2
SRCSEL1
EXMSEL
CX82100 Home Network Processor Data Sheet
Register Name
Description
SRAM Read/Write Wait State Control.
Note: The delay cycles are extra to the normal access cycles.
SRAM Chip Select 2.
Notes:
1.
2.
3.
SRAM Chip Select 1.
Note: EXMSEL must be 2’b10 if the first SRAM chip is selected.
External Memory Select.
00 =
01 =
10 =
11 =
00 =
01 =
10 =
11 =
00 =
01 =
10 =
11 =
00 =
01 =
10 =
11 =
EXMSEL must be 2’b10 if the second SRAM chip is selected.
The size for the second SRAM must be no greater than the size
of the first SRAM.
If the second SRAM size is programmed at a value greater than
that of the first SRAM, then the actual size for the second SRAM
will be reduced to the same size as the first automatically by the
hardware.
No extra delay.
Delayed by one BCLK period.
Delayed by two BCLK periods.
Delayed by three BCLK periods.
Do not select the second SRAM chip.
Select the second SRAM chip, size = 64K x 16.
Select the second SRAM chip, size = 128K x 16.
Select the second SRAM chip, size = 256K x 16.
Do not select the first SRAM chip.
Select the first SRAM chip, size = 64K x 16.
Select the first SRAM chip, size = 128K x 16.
Select the first SRAM chip, size = 256K x 16.
Select SDRAM interface; SDRAM in Disabled Mode.
Select SDRAM interface; SDRAM in Enabled Mode.
Select SRAM interface.
Reserved.
ASB Address
0x00350010
Type
RW
Default Value
0x00000000
101306C
6.12.1
Ref.