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PCI2040 Datasheet(PDF) 59 Page - Texas Instruments |
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PCI2040 Datasheet(HTML) 59 Page - Texas Instruments |
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59 / 79 page  6−2 • HPI data register (HPID). This register is directly accessible by the host and contains the data that was read from the HPI memory if the current access is a read, or the data that will be written to the HPI memory if the current access is a write. The two control inputs, HCNTL1 and HCNTL0, indicate which internal register is being accessed as shown below. Table 6−1. C54X HPI Registers Access Control HCNTL1 HCNTL0 DESCRIPTION 0 0 PCI2040 read/write to HPI control register. 0 1 PCI2040 read/write to HPI data register. Address auto-increment is selected. 1 0 PCI2040 read/write to HPI address register. 1 1 PCI2040 read/write to HPI data register. Address auto-increment is not selected. HPI control register is a 16-bit register but only 4 bits control the HPI operation. Because the transfer consists of two consecutive half-words, the HPI control register is organized such that it has the same high and low half-word contents. The control and status bits are located on the least significant 4 bits. When the host writes to the HPI control register, both bytes must be the same. |
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