CN8478 Datasheet, PDF (35/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
1.0 System Description
1.1 Pin Descriptions
Table 1-4. CN8478 Hardware Signal Definitions (3 of 6)
MQFP
Pin No.
Pin Label
Signal Name
I/O
2, 6, 10, RDAT[7:0] _{Receive Data} ⁽¹⁾
I
16, 20,
24, 30, 34
3, 7, 11, ROOF[7:0] Receiver
I
17, 21,
25, 31,
Out-of-Frame ⁽¹⁾
207
Definition
Serial data sampled on active edge of receive clock, RCLKx.
If channel is mapped to a time slot, input bit is sampled and
transferred to memory. If channel is unmapped to time slot, data
bit is considered invalid, and MUSYCC ignores received sample.
ROOFx is sampled on the specified active edge of the
corresponding receive clock, RCLKx. See ROOF_EDGE bit field in
Table 5-12.
As ROOFx signal transitions from low to high, an
Out-of-Frame (OOF) condition is indicated. As long as ROOFx is
asserted, the received serial data is considered OOF.
Depending on the state of OOFABT bit field in Table 5-10,
receive bit processing may be disabled for the entire channel
group (all channels disabled) while ROOFx remains asserted.
Upon deassertion of ROOFx, bit-level processing resumes for
all affected channels. If the flywheel mechanism is used, no other
synchronization signal is required, because MUSYCC tracks the
start of each subsequent frame during the OOF period. If the
flywheel mechanism is not used, then a subsequent RSYNCx
assertion is required to indicate the start of the next frame. See
SFALIGN bit field in Table 5-10.
100660E
Conexant
1-21