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DS3173N Datasheet(PDF) 40 Page - Dallas Semiconductor |
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DS3173N Datasheet(HTML) 40 Page - Dallas Semiconductor |
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40 / 232 page  DS3171/DS3172/DS3173/DS3174 40 of 230 Figure 8-10 shows the relationship between the DS3 transmit overhead port pins. Figure 8-10. DS3 Framing Transmit Overhead Port Timing TOH TOHSOF TOHCLK F74 C73 F73 12 3456 789 10 11 12 13 14 16 17 18 19 20 21 22 23 24 15 F11 X1 F13 C12 F12 C13 F14 F21 C21 X2 F23 C22 F22 C23 F24 F31 C31 P1 C32 F32 TOHEN C11 Figure 8-11 shows the relationship between the E3 G.751 transmit overhead port pins. Figure 8-11. E3 G.751 Framing Transmit Overhead Port Timing TOH TOHSOF TOHCLK N A FAS 10 12345678 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 15 FAS 2 FAS 3 FAS 1 FAS 6 FAS 5 FAS 4 FAS 7 FAS 8 FAS 10 A FAS 9 FAS 2 FAS 1 N FAS 3 FAS 4 FAS 6 FAS 8 FAS 5 FAS 9 FAS 9 TOHEN Figure 8-12 shows the relationship between the E3 G.832 transmit overhead port pins. Figure 8-12. E3 G.832 Framing Transmit Overhead Port Timing TOH TOHCLK GC 8 GC 7 GC 6 12345678 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 15 FA1 2 FA1 3 FA1 1 FA1 6 FA1 5 FA1 4 FA1 7 FA1 8 FA2 2 FA2 3 FA2 1 FA2 6 FA2 5 FA2 4 FA2 7 FA2 8 EM 2 EM 3 EM 1 EM 5 EM 4 TOHSOF TOHEN 8.3.3 DS3/E3 Serial Data Interface 8.3.3.1 DS3/E3 SCT Mode Transmit Serial Interface Pin Functional Timing The TSERn pin is used to input DS3 or E3 payload data bits in all framing modes as well as the C-bits, which can be treated as payload, in DS3 M23 and E3 G.751 framing modes. The TDENn signal is used to determine the DS3 or E3 payload bit positions on TSERn. The TDENn signal goes high three clocks before the first bit of a payload sequence is clocked into the TSERn pin and it goes low three clocks before the payload sequence is stopped being clocked in to the TSERn pin. The TSOFOn signal pulses high three clocks before the start of the DS3 or E3 overhead bit position on TSERn. The TSOFIn pin is used to set the DS3 or E3 frame position. When the TSOFIn pin transitions low to high, the first DS3/E3 overhead bit position on TSERn will be forced to align to it Figure 8-13 to Figure 8-15 show the relationship between the SCT transmit port pins. |
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