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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ST7285C Datenblatt(PDF) 75 Page - STMicroelectronics |
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ST7285C Datenblatt(HTML) 75 Page - STMicroelectronics |
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75 / 117 page  75/117 ST7285C RDS G.B.S. (Cont’d) 4.9.3.3 GBS Registers Sixteen registers are dedicated to interfacing the Group and Block Synchronization module to the CPU. These registers, together with their symbolic names, bit names and address are presented in tabular form in Table 10 below and are here de- scribed in greater detail. Register Reset States: all registers bits are set to “0” during Reset, except for CNA4-CNA0, CNB1, CNB0 and ORD, which are set to “1”. SRx - Shift Registers b7,6 = SR0: contain the 2 last transmitted bits c1’,c0’ of the checkword. b5-0 are not used and are always read as “0”. b7-0 = SR1: contain the 8 first transmitted bits (c9’...c2’) of the checkword. b7-0 = SR2: contain the 8 last information bits (m7’...m0’) of the message vector. b7-0 = SR3: contain the 8 first information bits (m15’...m8’) of the message vector. SY0 - Polynomial Register 0 b7,6 = SY0: contain the 2 least significant bits of the calculated syndrome. For valid syndromes, these two bits are “0. b5 is not used, and is always read as “0”. b4 = US (USA option). Setting US to “1” enables detection of block E. b3 = ORD flag. Set to “1” when block counter CB[1:0] is equal to block code BL[1:0]: otherwise it is “0”. Stable with VSI or CNI. Read only. Reset Value is one. b2-0 = BL[2:0] block code, see Table 9. Stable with CNI or VSI. Read only. SY1 - Polynomial Register 1 b7-0 = SY1: contain the 8 most significant bits (p9’...p2’) of the calculated syndrome. Table 10. GBS Register Map Register Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 SR0 - shift reg. 0 0060h c 1’c0’ - --- -- SR1 - shift reg. 1 0061h c9’c8’c7’c6’c5’c4’c3’c2’ SR2 - shift reg. 2 0062h m7 m6 m5 m4 m3 m2 m1 m0 SR3 - shift reg. 3 0063h m 15 m 14 m 13 m 12 m 11 m 10 m 9 m 8 SY0 - polynomial reg. 0 0064h p 1 p 0 - US ORD BL2 BL1 BL0 SY1 - polynomial reg. 1 0065h p9 p8 p7 p6 p5 p4 p3 p2 GS_CNT - count reg. 0066h CNB1 CNB0 SYNC CNA4 CNA3 CNA2 CNA1 CNA0 GS_INT - interrupt reg. 0067h CAL CAR ECM VSI VSE CNI CE1 CE0 DR0 - RDSDAT reg. 0 0068h DR1 DR0 - MQE SQE QAL RCL RDA DR1 - RDSDAT reg. 1 0069h DR9 DR8 DR7 DR6 DR5 DR4 DR3 DR2 DR2 - RDSDAT reg. 2 006Ah DR17 DR16 DR15 DR14 DR13 DR12 DR11 DR10 DR3 - RDSDAT reg. 3 006Bh DR25 DR24 DR23 DR22 DR21 DR20 DR19 DR18 QR0 - QUALITY reg. 0 006Ch QR1 QR0 - - - - - - QR1 - QUALITY reg. 1 006Dh QR9 QR8 QR7 QR6 QR5 QR4 QR3 QR2 QR2 - QUALITY reg. 2 006Eh QR17 QR16 QR15 QR14 QR13 QR12 QR11 QR10 QR3 - QUALITY reg. 3 006Fh QR25 QR24 QR23 QR22 QR21 QR20 QR19 QR18 |
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