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IDT72521L50GB Datasheet(PDF) 7 Page - Integrated Device Technology |
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IDT72521L50GB Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 28 page IDT72511/IDT72521 BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY MILITARY AND COMMERCIAL TEMPERATURE RANGES 5.32 7 The Command Register is written by setting CSA = 0, A1 = 1, A0 = 1. Commands written into the BiFIFO have a 4-bit opcode (bit8 – bit 11) and a 3-bit operand (bit 0 – bit 2) as shown in Figure 3. The commands can be used to reset the BiFIFO, to select the Configuration Register, to perform intel- ligent reread/rewrite, to set the Port B DMA direction, to set the Status Register format, and to modify the Port B Read and Write Pointers. The command opcodes are shown in Table 2. The reset command initializes different portions of the BiFIFO depending on the command operand. Table 3 shows the reset command operands. The configuration Register address is set directly by the COMMAND FORMAT 15 12 11 8 7 3 2 0 2668 tbl 02 Figure 3. Format for Commands Written into Port A X X X X Command Opcode X X X X X Command Operand command operands shown in Table 4. Intelligent reread/rewrite is performed by interchanging the Port B Read Pointer with the Reread Pointer or by interchanging the Port B Write Pointer with the Rewrite Pointer. No command operands are required to perform a reread/ rewrite operation. When Port B of the BiFIFO is in peripheral mode, the DMA direction is controlled by the Command Register. Table 5 shows the Port B read/write DMA direction operands. Two commands are provided to increment the Port B Read and Write Pointers. No operands are required for these commands. |
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