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TSB43AB21 Datasheet(PDF) 27 Page - Texas Instruments |
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TSB43AB21 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 109 page  3–6 3.6 Class Code and Revision ID Register The class code and revision ID register categorizes the TSB43AB21 device as a serial bus controller (0Ch), controlling an IEEE 1394 bus (00h), with an OHCI programming model (10h). Furthermore, the TI chip revision is indicated in the least significant byte. See Table 3–5 for a complete description of the register contents. Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Name Class code and revision ID Type R R R R R R R R R R R R R R R R Default 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name Class code and revision ID Type R R R R R R R R R R R R R R R R Default 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 Register: Class code and revision ID Offset: 08h Type: Read-only Default: 0C00 1000h Table 3–5. Class Code and Revision ID Register Description BIT FIELD NAME TYPE DESCRIPTION 31–24 BASECLASS R Base class. This field returns 0Ch when read, which broadly classifies the function as a serial bus controller. 23–16 SUBCLASS R Subclass. This field returns 00h when read, which specifically classifies the function as controlling an IEEE 1394 serial bus. 15–8 PGMIF R Programming interface. This field returns 10h when read, which indicates that the programming model is compliant with the 1394 Open Host Controller Interface Specification. 7–0 CHIPREV R Silicon revision. This field returns 00h when read, which indicates the silicon revision of the TSB43AB21 device. 3.7 Latency Timer and Class Cache Line Size Register The latency timer and class cache line size register is programmed by host BIOS to indicate system cache line size and the latency timer associated with the TSB43AB21 device. See Table 3–6 for a complete description of the register contents. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name Latency timer and class cache line size Type R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: Latency timer and class cache line size Offset: 0Ch Type: Read/Write Default: 0000h Table 3–6. Latency Timer and Class Cache Line Size Register Description BIT FIELD NAME TYPE DESCRIPTION 15–8 LATENCY_TIMER R/W PCI latency timer. The value in this register specifies the latency timer for the TSB43AB21 device, in units of PCI clock cycles. When the TSB43AB21 device is a PCI bus initiator and asserts PCI_FRAME, the latency timer begins counting from zero. If the latency timer expires before the TSB43AB21 transaction has terminated, the TSB43AB21 device terminates the transaction when its PCI_GNT is deasserted. 7–0 CACHELINE_SZ R/W Cache line size. This value is used by the TSB43AB21 device during memory write and invalidate, memory-read line, and memory-read multiple transactions. |
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