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CS62180 データシート(PDF) 10 Page - Cirrus Logic |
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CS62180 データシート(HTML) 10 Page - Cirrus Logic |
10 / 50 page Common Control Register The Common Control Register (CCR) deter- mines global operating characteristics common to both the transmitter and receiver. It currently provides for selection of the framing mode (193S, 193E, SLC-96 ® or T1DM), the format of yellow alarms, the zero suppression format (B7 or B8ZS), loopback operation, and control of output to RSR.2. See Figure 4a for an overview of the CCR. Loopback CCR.0: LPBK S e t tin g LP BK (CCR. 0) to "1 " puts the CS62180B into loopback mode. While in loopback, the TPOS/TNEG and TCLK outputs are internally rerouted directly to the RPOS/RNEG and RCLK inputs, while an un- framed, all "1’s" stream is output on the TPOS/TNEG pins. All operating modes, except blue alarm transmission, remain functional dur- ing loopback. Note that enabling loopback will usually invoke an out-of-frame (OOF) error un- til the receiver can resync to the new framing alignment. See the section on the Receive Con- trol Register (RCR) for a description of the resync options available. Zero Suppression CCR.1: B7 CCR.2: B8ZS B7 and B8ZS select the zero suppression mode. Setting B7 (CCR.1) to "1" will enable bit 7 zero substitution. This causes any channel word with all zeros to be transmitted with bit 7 (2 nd LSB) forced to a "1". B7 mode only affects the transmitter, the receiver does not decode B7. Note that bit 7 stuffing can be disabled on an individual channel basis for clear channel trans- mission via the Transmit Transparent Registers TTR1 - TTR3 (see description of transmitter which follows). B8ZS coding operates independent of channel boundaries, and is transparent to all other func- tions. When using B8ZS, the final transmission stream is examined before transmission, and any eight consecutive zeros will be replaced with a B8ZS code word before transmission. If B8ZS (CCR.2) is set to a "1", B8ZS zero substitution will be enabled in the transmitter. Independent of the setting of CCR.2, any incoming B8ZS codes will be inter- cepted by the receiver and replaced with 8 zeros before being processed by the rest of the receive side. The receiver is always capable of receving either AMI or B8ZS encoded data. Note: For T1DM, CCR.1 and CCR.2 should be set to a "0" since DDS ® equipment assures a 1- in-8 one’s density. 7 (MSB) 654321 0 (LSB) FM1 FRSR2 EYELMD FM YELS B8ZS B7 LPBK See Fig. 4b 0B8ZS 0 FDL See Fig. 4b 0 Bit 2 0 Disable 0 Transparent 0 Normal 1 COFA 1 Bit 2 1 S-bit 1 Enable 1 B7 Stuffing 1 Loopback Figure 4a. Common Control Register (CCR) CS62180B 10 DS225PP2 |
同様の部品番号 - CS62180 |
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同様の説明 - CS62180 |
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