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CS62180B Datasheet(PDF) 11 Page - Cirrus Logic |
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CS62180B Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 50 page 193S Yellow Alarm Format CCR.3: YELS The CS62180B supports two different yellow alarm formats for 193S framing. Whichever format is selected, it will be used by both the transmit side, for yellow alarm genera- tion, and the receive side, for alarm detection. When using 193S framing, a "0" in YELS (CCR.3) will encode/decode yellow alarms as a "0" in bit 2 (2 nd MSB) of all channels. Setting CCR.3 to "1" will cause yellow alarms to be en- coded/decoded as a "1" is the S-bit position of frame 12. Note: For T1DM and SLC-96 ®, CCR.3 should be set to a "0". Framing Format CCR.4: FM CCR.7: FM1 As shown in Figure 4b, CCR.4 and CCR.7 select the framing format. See the text for the Transmit Control Register (TCR) and Re- ceive Control Register (RCR) for further information on the particular options available for each framing format. Note: Changing the framing mode does not force the receiver to resynchronize. A forced resync should be done to insure correct receiver synchronization after the framing mode is changed. 193E Yellow Alarm Format CCR.5: EYELMD The CS62180B supports two different yellow alarm formats for 193E framing. Whichever format is selected, it will be used by both the transmit side, for yellow alarm genera- tion, and the receive side, for alarm detection. When using 193E framing, a "0" in EYELMD (CCR.5) will encode/decode yellow alarms as a repeating sequence of 00FF (hex) on the 4 kHz facility data link (FDL). If CCR.5 is set, 193E yellow alarms will be handled as a "0" in bit 2 (2 nd MSB) of all channels. Control of RSR.2 CCR.6: FRSR2 CCR.6 allows you to change the meaning of D2 in the Receive Status Register (RSR.2). If CCR.6 is clear, RSR.2 will report the detection of B8ZS codes in the received T1 input. If CCR.6 is set to a "1", RSR.2 will be used to signal a Change of Frame Alignment (COFA). A COFA is reported when the last receiver resync resulted in a change of framing or multiframing alignment. Refer to the description of the Receive Status Register for further information. 74 FM1 FM Format Selected 0 0 193S (D4) 0 1 193E (ESF) 1 0 SLC-96 1 1 T1DM Figure 4b. Framing Format Selection CS62180B DS225PP2 11 |
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