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8-10
ColdFire CF4e Core User’s Manual
For More Information On This Product,
Go to: www.freescale.com
Local Memory Connection Specification
The kram0csb and kram1csb signals are the chip selects for KRAM0 and KRAM1. If a
chip-select signal is negated, all other KRAM signals are don’t cares. If multiple array
instances are used to implement the KRAM array configuration, the signal must be used as
the chip enable for all instances.
The kram0web[3:0] and kram1web[3:0] signals are the byte write enables. The byte write
enables correspond to the 4 data bytes in the 32-bit KRAM, as shown in Table 8-5.
8.4.1.2 KROM Controller Information
The KROM controllers uses synchronous ROM memory arrays external to the core. These
arrays must use the same clock as the core.
Table 8-4. KRAM0/KRAM1 Array Address Connection
kram{0,1}size[3:0]
Total Size
Configuration
Array Address
Unused Address
0000
0 bytes
KRAM0 disabled
KRAM1 disabled
—
kram0addr[15:2]
kram1addr[15:2]
0001
512 bytes
128 X 4 bytes
128 X 4 bytes
kram0addr[8:2]
kram1addr[8:2]
kram0addr[15:9]
kram1addr[15:9]
0010
1 Kbytes
256 X 4 bytes
256 X 4 bytes
kram0addr[9:2]
kram1addr[9:2]
kram0addr[15:10]
kram1addr[15:10]
0011
2 Kbytes
512 X 4 bytes
512 X 4 bytes
kram0addr[10:2]
kram1addr[10:2]
kram0addr[15:11]
kram1addr[15:11]
0100
4 Kbytes
1024 X 4 bytes
1024 X 4 bytes
kram0addr[11:2]
kram1addr[11:2]
kram0addr[15:12]
kram1addr[15:12]
0101
8 Kbytes
2048 X 4 bytes
2048 X 4 bytes
kram0addr[12:2]
kram1addr[12:2]
kram0addr[15:13]
kram1addr[15:13]
0110
16 Kbytes
4096 X 4 bytes
4096 X 4 bytes
kram0addr[13:2]
kram1addr[13:2]
kram0addr[15:14]
kram1addr[15:14]
0111
32 Kbytes
8192 X 4 bytes
8192 X 4 bytes
kram0addr[14:2]
kram1addr[14:2]
kram0addr[15]
kram1addr[15]
1000
64 Kbytes
16384 X 4 bytes
16384 X 4 bytes
kram0addr[15:2]
kram1addr[15:2]
—
—
1001–1111
RFU
RFU
RFU
RFU
Table 8-5. KRAM0/KRAM1 Byte Write Enables
Byte Write Enable
Array Data in Bits Controlled
kram0web[0]
kram1web[0]
kram0di[31:24]
kram1di[31:24]
kram0web[1]
kram1web[1]
kram0di[23:16]
kram1di[23:16]
kram0web[2]
kram1web[2]
kram0di[15:8]
kram1di[15:8]
kram0web[3]
kram1web[3]
kram0di[7:0]
kram1di[7:0]
F
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