Rainbow Electronics DS2180A - Manual (Page 4)

DS2180A
041995 4/36
POWER AND TEST PIN DESCRIPTION (40–PIN DIP ONLY) Table 3
PIN SYMBOL TYPE DESCRIPTION
20 V
SS
– Signal Ground. 0.0 volts.
32 TEST I Test Mode. Tie to V
SS
for normal operation.
40 V
DD
– Positive Supply. 5.0 volts.
RECEIVE PIN DESCRIPTION (40–PIN DIP ONLY) Table 4
PIN SYMBOL TYPE DESCRIPTION
21 RYEL O Receive Yellow Alarm. Transitions high when yellow alarm detected, goes
low when alarm clears.
22 RLINK O Receive Link Data. Updated with extracted FDL data one RCLK before start
of odd frames (193E) and held until next update. Updated with extracted S-bit
data one RCLK before start of even frames (193S) and held until next update.
23 RLCLK O Receive Link Clock. 4 KHz demand clock for RLINK.
24 RCLK I Receive Clock. 1.544 MHz primary clock.
25 RCHCLK O Receive Channel Clock. 192 KHz clock identifies time slot (channel) bound-
aries.
26 RSER O Receive Serial Data. Received NRZ serial data, updated on rising edges of
RCLK.
27 RFSYNC O Receive Frame Sync. Extracted 8 KHz clock, one RCLK wide, indicates F-
Bit position in each frame.
28 RMSYNC O Receive Multiframe Sync. Extracted multiframe sync; edge indicates start
of multiframe, 50% duty cycle.
29 RABCD O Receive ABCD Signaling. Extracted signaling data output, valid for each
channel time in signaling frames. In non-signaling frames, RABCD outputs
the LSB of each channel word.
30 RSIGFR O Receive Signaling Frame. High during signaling frames, low during resync
and non-signaling frames.
31 RSIGSEL O Receive Signaling Select. In 193E framing a .667 KHz clock which identi-
fies signaling frames A and C. A 1.33 KHz clock in 193S.
33 RST I Reset. A high-low transition clears all internal registers and resets receive
side counters. A high-low-high transition will initiate a receive resync.
34
35 RPOS
RNEG
I
Receive Bipolar Data Inputs. Samples on falling edge of RCLK. Tie togeth-
er to receive NRZ data and disable bipolar violation monitoring circuitry.
36 RCL O Receive Carrier Loss. High if 32 consecutive 0’s appear at RPOS and
RNEG; goes low after next 1.
37 RBV O Receive Bipolar Violation. High during accused bit time at RSER if bipolar
violation detected, low otherwise.
38 RFER O Receive Frame Error. High during F-Bit time when F
T
or F
S
errors occur
(193S) or when FPS or CRC errors occur (193E). Low during resync.
39 RLOS O Receive Loss of Sync. Indicates sync status; high when internal resync is
in progress, low otherwise.