The length of a data transfer is defined by one or more command words. Each command word includes a byte count. There are two ways to define the byte count. The method is defined by [EXPONENT]:
- 0: Byte count is in [imm_data]. Range is 0 to 128 (
80h) bytes. - 1: Exponent byte count = 2^[imm_data]. Range is 2, 4, 8, 16, and to megabytes.
Programming Examples
There are four data transfer length examples. Set [data_transfer] = 1.
| Byte Count | [imm_data] | [exponent] |
|---|---|---|
| 64 Byte Transfer | ||
40h
|
0 | |
| 128 Byte Transfer | ||
80h
|
0 | |
| 1000 Byte Transfer - Option 1 | ||
09h
|
1 | |
08h
|
1 | |
E8h
|
0 | |
| 1000 Byte Transfer - Option 2 | ||
08h
|
1 | |
08h
|
1 | |
08h
|
1 | |
E8h
|
0 | |
| 1 GB Transfer | ||
1Eh
|
1 | |