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TLK2201AJRGQE Datasheet(PDF) 4 Page - Texas Instruments |
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TLK2201AJRGQE Datasheet(HTML) 4 Page - Texas Instruments |
4 / 20 page TLK2201AJR 1.0 Gb to 1.6 Gb SMALL FORMFACTOR ETHERNET TRANSCEIVER SLLS614A − MARCH 2004 − REVISED MAY 2007 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description data transmission The TLK2201AJR supports both the defined 10-bit interface (TBI) and a reduced 5-bit interface with DDR clocking. When MODESEL is low, the TBI mode is selected. When MODESEL is high, the DDR mode is selected. In the TBI mode, the transmitter portion registers incoming 10-bit wide data words (8b/10b encoded data, TD0−TD9) on the rising edge of REFCLK. The REFCLK is also used by the serializer, which multiplies the clock by a factor of 10, providing a signal that is fed to the shift register. The 8b/10b encoded data is transmitted sequentially bit 0 through 9 over the differential high-speed I/O channel. In the DDR mode, the transmitter accepts 5-bit wide 8-b/10-b encoded data on pins TD0−TD4. In this mode data is aligned to both the rising and falling edges of REFCLK. The data is then formed into a 10-bit wide word and sent to the serializer. The data is clocked most significant bit first (i.e. the bits 0−4 of the 8-b/10-b encoded data). transmission latency The data transmission latency of the TLK2201AJR is defined as the delay from the initial 10-bit word load to the serial transmission of bit 9. The minimum latency in TBI mode is 19 bit times. The maximum latency in TBI mode is 20 bit times. The minimum latency in DDR mode is 29 bit times, and maximum latency in DDR mode is 30 bit times. 10 Bit Code TXP, TXN TD(0−9) REFCLK Td(Tx latency) 10 Bit Code b9 Figure 1. Transmitter Latency Full Rate Mode data reception The receiver portion of the TLK2201AJR deserializes the differential serial data. The serial data is retimed based on an interpolated clock generated from the reference clock. The serial data is then aligned to the 10-bit word boundaries and presented to the protocol controller along with receive byte clocks (RBC0, RBC1). |
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