II CORE BLOCK: BCU (Bus Control Unit)
External Memory Map and Chip Enable
The BCU has a
The C33 Core Block is limited to 24 available pins for the address bus and 7 pins for the #CE output due to its package structure. However, the #CE[4:10] output pins can be switched to the
Table 4.5 Switching of #CE Output
Pin | CEFUNC = "00" | CEFUNC = "01" | CEFUNC = "1x" |
#CE4 | #CE4 | #CE11 | #CE11+#CE12 |
#CE5 | #CE5 | #CE15 | #CE15+#CE16 |
#CE6 | #CE6 | #CE6 | #CE7+#CE8 |
#CE7/#RAS0 | #CE7/#RAS0 | #CE13/#RAS2 | #CE13/#RAS2 |
#CE8/#RAS1 | #CE8/#RAS1 | #CE14/#RAS3 | #CE14/#RAS3 |
#CE9 | #CE9 | #CE17 | #CE17+#CE18 |
#CE10EX | #CE10EX | #CE10EX | #CE9+#CE10EX |
|
| (Default: CEFUNC = "00") |
The
Furthermore, when CEFUNC is set to "10" or "11", five chip enable signals are expanded into two area size. Although the C33 Core Block has only 24 address output pins, it features
BCU
Area | Address |
| |
Area 10 (#CE10) | 0x0FFFFFF |
| |
SRAM type |
| External memory 6 (4MB) | |
Burst ROM type |
| ||
|
| ||
8 or 16 bits | 0x0C00000 |
| |
Area 9 (#CE9) | 0x0BFFFFF |
| |
SRAM type |
| External memory 5 (4MB) | |
Burst ROM type |
| ||
|
| ||
8 or 16 bits | 0x0800000 |
| |
Area 8 (#CE8/#RAS1) | 0x07FFFFF |
| |
SRAM type |
| External memory 4 (2MB) | |
DRAM type |
| ||
|
| ||
8 or 16 bits | 0x0600000 |
| |
Area 7 (#CE7/#RAS0) | 0x05FFFFF |
| |
SRAM type |
| External memory 3 (2MB) | |
DRAM type |
| ||
|
| ||
8 or 16 bits | 0x0400000 |
| |
Area 6 (#CE6) | 0x03FFFFF | External I/O | |
SRAM type | 0x0380000 | ||
| |||
| 0x037FFFF | External I/O | |
| 0x0300000 | ||
|
| ||
Area 5 (#CE5) | 0x02FFFFF |
| |
SRAM type |
| External memory 2 (1MB) | |
8 or 16 bits |
| ||
|
| ||
| 0x0200000 |
| |
Area 4 (#CE4) | 0x01FFFFF |
| |
SRAM type |
| External memory 1 (1MB) | |
8 or 16 bits |
| ||
|
| ||
| 0x0100000 |
| |
| CEFUNC = "00" |
Area | Address |
| |
| Area 17 (#CE17) | 0xBFFFFFF | (Mirror of External memory 6) |
| SRAM type | ||
| 0x9000000 |
| |
| 8 or 16 bits | 0x8FFFFFF | External memory 6 (16MB) |
|
| 0x8000000 | |
|
|
| |
| Area 15 (#CE15) | 0x5FFFFFF | (Mirror of External memory 5) |
| SRAM type | ||
| 0x5000000 |
| |
| 8 or 16 bits | 0x4FFFFFF | External memory 5 (16MB) |
|
| 0x4000000 | |
|
|
| |
| Area 14 (#CE14/#RAS3) | 0x3FFFFFF |
|
| SRAM type |
| External memory 4 (16MB) |
| DRAM type |
| |
|
|
| |
| 8 or 16 bits | 0x3000000 |
|
| Area 13 (#CE13/#RAS2) | 0x2FFFFFF |
|
| SRAM type |
| External memory 3 (16MB) |
| DRAM type |
| |
|
|
| |
| 8 or 16 bits | 0x2000000 |
|
| Area 11 (#CE11) | 0x17FFFFF |
|
| SRAM type |
| External memory 2 (8MB) |
| 8 or 16 bits |
| |
|
|
| |
|
| 0x1000000 |
|
| Area 10 (#CE10) | 0x0FFFFFF |
|
| SRAM type |
| External memory 1 (4MB) |
| Burst ROM type |
| |
|
|
| |
| 8 or 16 bits | 0x0C00000 |
|
| Area 6 (#CE6) | 0x03FFFFF | External I/O |
| SRAM type | 0x0380000 | |
|
| ||
|
| 0x037FFFF | External I/O |
|
| 0x0300000 | |
|
|
| |
|
| CEFUNC = "01" |
S1C33L03 FUNCTION PART | EPSON |