DS2181A 查看數據表（PDF） - Maxim Integrated
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DS2181A Datasheet PDF : 32 Pages
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NOTES:
1. These output status pins are only available on the DS2181AQ.
2. If the TEST pin is tied low and CCR.1=0, then these pins will be tri–stated.
DS2181A
RECEIVE PIN DESCRIPTION (40-PIN DIP ONLY) Table 2B
PIN SYMBOL TYPE
DESCRIPTION
21
RRA
O Receive Remote Alarm. Transitions high when alarm detected;
returns low when alarm cleared.
22 RMDA
O Receive Distant Multiframe Alarm. Transitions high when alarm
detected; returns low when alarm cleared.
23
RAF
24
RCLK
O Receive Alignment Frame. High during frames containing the frame
alignment signal, low otherwise.
I
Receive Clock. 2.048 MHz primary clock.
25 RCHCLK
O
Receive Channel Clock. 256 kHz clock, identifies timeslot
boundaries; useful for serial-to-parallel conversion of channel data.
26
RSER
O Receive Channel Clock. 256 kHz clock, identifies timeslot
boundaries; useful for serial-to-parallel conversion of channel data.
27 RFSYNC
O Receive Frame Sync. Trailing edge indicates start of frame.
28 RMSYNC
O
Receive Multiframe Sync. Low-high transition indicates start of
CAS multiframe; held high during frame 0.
29
RSD
O Receive Signaling Data. Extracted timeslot 16 data; updated on
rising edge of RCLK.
30
RSTS
O Receive Signaling Timeslot. High during timeslot 16 of every frame,
low otherwise.
31 RCSYNC
O
Receive CRC4 Sync. Low-high transition indicates start of CRC4
multiframe; held high during CRC4 frames 0 through 7 and held low
during frames 8 through 15.
33
RST
I
Reset. Must be asserted during device power-up and when changing
to/from the hardware mode.
34
RPOS
I
Receive Bipolar Data. Sampled on falling edges of RCLK. Tie
35
RNEG
together to receive NRZ data and disable BPV monitor circuitry.
36
RCL
O Receive Carrier Loss. Low-high transition indicates loss of carrier.
37
RBV
O Receive Bipolar Violation. Pulses high during detected bipolar
violations.
38
RFER
O Receive Frame Error. Pulses high when frame alignment, CAS
multiframe alignment or CRC4 words received in error.
39
RLOS
O Receive Loss of Sync. Indicates synchronizer status; high when
frame, CAS and/or CRC4 multiframe search underway, low
otherwise.
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