12.1 Without the PE

To program a block of memory without using the PE, the block of data must first be written to RAM. This method requires the programmer to transfer the actual machine instructions with embedded (immediate) data for writing the block of data to the devices internal RAM memory.
Figure 12-1. Downloading Data without PE

The following steps are required to download a block of data:

1. XferInstruction (op code).

2. Repeat step 1 until the last instruction is transferred to CPU.

Table 12-1. Download Data OP Codes
Step NumberOp CodeInstruction
Step 1Initialize SRAM base address to 0xA0000000.
3c10a000lui s0, 0xA000;
Step 2Write the entire row of data to be programmed into system SRAM.
3c08<DATA>
3508<DATA>
ae08<OFFSET>
 
lui    t0, <DATA(31:16)>;
ori    t0, t0, <DATA(15:0)>;
sw     t0, <OFFSET>(s0);
// OFFSET increments by 4
Step 3Repeat step 2 until one row of data is loaded.