Rainbow Electronics DS2182A - Manual (Page 3)

DS2182A
041995 3/22
PIN DESCRIPTION Table 1
PIN SYMBOL TYPE DESCRIPTION
6 NC – No Connect. No internal connection. This pin can be tied to either V
SS
or V
DD
, or it can be floated.
7 RYEL O Receive Yellow Alarm. Transitions high when yellow alarm detected;
goes low when alarm clears.
8 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 ex-
tracted S-bit data one RCLK before start of even frames (193S) and held
until next update.
9 RLCLK O Receive Link Clock. 4 KHz demand clock for RLINK.
10 RCLK I Receive Clock. 1.544 MHz primary clock.
11 RCHCLK O Receive Channel Clock. 192 KHz clock; identifies time slot (channel)
boundaries.
12 RSER O Receive Serial Data. Received NRZ serial data; updated on rising edges
of RCLK.
13 NC - No Connect. No internal connection. This pin can be tied to either V
SS
or V
DD
, or it can be floated.
15 RFSYNC O Receive Frame Sync. Extracted 8 KHz clock, one RCLK wide; F-bit posi-
tion in each frame.
16 RMSYNC O Receive Multiframe Sync. Extracted multiframe sync; positive-going
edge indicates start of multiframe; 50% duty cycle.
17 RABCD O Receive ABCD Signaling. Extracted signaling data output; valid for each
channel in signaling frames. In non-signaling frames, RABCD outputs
the LSB of each channel word.
18 RSIGFR O Receive Signaling Frame. High during signaling frames; low during
non-signaling frames (and during resync).
19 RSIGSEL O Receive Signaling Select. In 193E framing, a .667 KHz clock that identi-
fies signaling frames A and C; a 1.33 KHz clock in 193S.
21 RST I Reset. A high-low transition clears all internal registers and resets count-
ers. A high-low-high transition initiates a resync.
22
23 RPOS
RNEG I Receive Bipolar Data Inputs. Sampled on falling of RCLK. Tie together
to receive NRZ data and disable bipolar violation monitoring circuitry.
24 RCL O Receive Carrier Loss. High if 192 consecutive 0s appear at RPOS and
RNEG; goes low upon seeing 12.5% one’s density.
25 RBV O Receive Bipolar Violation. High during accused bit time at RSER. If
bipolar violation detected, low otherwise.
26 RFER O Receive Frame Error. High during F-bit time when FT or FS errors occur
(193S), or when FPS or CRC errors occur (193E). Low during resync.
27 RLOS O Receive Loss of Sync. Indicates sync status; high when internal resync
is in progress, low otherwise.