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TSB42AC3IPZT Datasheet(PDF) 11 Page - Texas Instruments |
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TSB42AC3IPZT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 70 page 1 SLLS593A—January 2006 TSB42AC3 2 Architecture 2.1 Function Block Diagram The functional block diagram of the TSB42AC3 is shown in Figure 2−1. Transmitter Cycle Timer Cycle Monitor CRC Receiver Configuration Registers (CFR) GRF ITF ATF P h y s i c a l I n t e r f a c e H o s t I n t e r f a c e FIFO Host Processor Serial Bus LINK CORE ACK Figure 2−1. Function Block Diagram 2.1.1 Physical Interface The physical (PHY) interface provides PHY-level services to the transmitter and receiver. This includes gaining access to the serial bus, sending packets, receiving packets, sending and receiving acknowledge packets, and reading and writing PHY registers. The PHY interface module also interfaces to the PHY chip and conforms to the PHY-link interface specification described in Annex J of the IEEE 1394−1995 standard (see Section 7 of this document for more information). 2.1.2 Transmitter The transmitter retrieves data from either the ATF or the ITF and creates correctly formatted serial-bus packets to be transmitted through the PHY interface. When data is present at the ATF interface to the transmitter, the TSB42AC3 PHY interface arbitrates for the serial bus immediately. When the data is present at the ITF interface to the transmitter, the TSB42AC3 arbitrates for the serial bus during the next isochronous cycle. The transmitter autonomously sends the cycle-start packets when the chip is a cycle master. The PHY interface provides PHY-level services to the transmitter and receiver. This included gaining access to the serial bus, sending packets, receiving packets, and sending and receiving acknowledge packets. |
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