100234d conexant 1 conexant proprietary and confidential 100234d november 1, 2000 bt8953a/ rs8953b product bulletin product affected: bt8953a, rs8953b bclk phase constraints in repeater mode; non-conformance while in repeater mode (repeat_en = 1 for ch1 & ch2), a bclk1 to bclk2 phase difference of 180 degrees, +/- 5 nsec, will result in corrupted data transfer. all other phase relationships are acceptable. in a repeater-mode application, to prevent a phase difference of 180 degrees between bclk1 and bclk2, the same clock is feed to both bclk1 and bclk2. to use the same clock for both hdsl transceivers, one hdsl transceiver needs to be slaved to the other hdsl transceiver. this is accomplished by setting the hdsl transceiver, which is configured as htu-c, to ?parallel slave mode?. then the parallel signals, from the hdsl transceiver, need to be externally converted to ?serial, sign first mode? to interface to the bt8953a/rs8953b. to configure the zipwire transceiver to ?parallel slave mode?, address 0x06 of the zipwire transceiver needs to be modified. also to align the sign and magnitude data correctly, the tbclk_pol and rbclk_pol needs to set properly. the tbclk_pol and rdbclk_pol are controlled by address 0x06 of the zipwire transceiver. tq[1,0] should be sampled on the falling edge of tbclk. rq[1,0] should be sampled on the falling edge of rbclk.
100234d conexant 2 conexant proprietary and confidential bt8953a/rs8953b product bulletin 100234_001 hclk bclk clk qclk tdat rdat bclk1 qclk1 tdat1 rdat1 bclk0 q d clk q d tbclk rbclk tq0 tq1 rq0 rq1 qclk0 tdat0 rdat0 mclk mclk htu-r bt9853a htu-c zipwire transceiver zipwire transceiver 1 0 1 0 0 1
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