cy7b9234 Cypress Semiconductor Corporation., cy7b9234 Datasheet - Page 4

• Manufacturer Part Number: cy7b9234
• Description: Smpte Hotlink Transmitter/receiver
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-02014 Rev. *A
Pin Description
CY7B9334 SMPTE HOTLink Receiver (continued)
RVS (Q
RDY
CKR
A/B
INA±
INB
(INB+)
SI
(INB−)
SO
RF
REFCLK
MODE
BISTEN
V
V
GND
Name
CCN
CCQ
j
)
TTL Out
TTL Out
TTL Out
PECL in
Diff In
PECL in
(Diff In)
PECL in
(Diff In)
TTL Out
TTL In
TTL In
3-Level In
TTL In
I/O
Received Violation Symbol. A HIGH on RVS indicates that a code rule violation has been detected in
the received data stream. A LOW shows that no error has been detected. In BIST mode, a LOW on
RVS indicates correct operation of the Transmitter, Receiver, and link on a byte-by-byte basis. When
MODE is HIGH (placing the receiver in Unencoded mode), RVS acts as the Q
same timing as Q
Data Output Ready. A LOW pulse on RDY indicates that new data has been received and is ready to be
delivered. A missing pulse on RDY shows that the received data is the Null character (normally inserted by
the transmitter as a pad between data inputs). In BIST mode RDY will remain LOW for all but the last byte of
a test loop and will pulse HIGH one byte time per BIST loop.
Clock Read. This byte rate clock output is phase and frequency aligned to the incoming serial data
stream. RDY, Q
Serial Data Input Select. This PECL 100K (+5V referenced) input selects INA or INB as the active
data input. If A/B is HIGH, INA is connected to the shifter and signals connected to INA will be decoded. If
A/B is LOW INB is selected.
Serial Data Input A. The differential signal at the receiver end of the communication link may be
connected to the differential input pairs INA± or INB±. Either the INA pair or the INB pair can be used as
the main data input and the other can be used as a loopback channel or as an alternative data input selected
by the state of A/B.
Serial Data Input B. This pin is either a single-ended PECL data receiver (INB) or half of the INB
differential pair. If SO is wired to V
with INA±. If SO is normally connected and loaded, INB becomes a single-ended PECL 100K (+5V refer-
enced) serial data input. INB is used as the test clock while in Test mode.
Status Input. This pin is either a single-ended PECL status monitor input (SI) or half of the INB
differential pair. If SO is wired to V
changeably with INA±. If SO is normally connected and loaded, SI becomes a single-ended PECL
100K (+5V referenced) status monitor input, which is translated into a TTL-level signal at the SO pin.
Status Out. SO is the TTL-translated output of SI. It is typically used to translate the Carrier Detect
output from a fiber-optic receiver connected to SI. When this pin is normally connected and loaded
(without any external pull-up resistor), SO will assume the same logical level as SI and INB will become
a single-ended PECL serial data input. If the status monitor translation is not desired, then SO may
be wired to V
Reframe Enable. RF controls the Framer logic in the Receiver. When RF is held HIGH, each SYNC
(K28.5) symbol detected in the shifter will frame the data that follows. If is HIGH for 2,048 consecutive
bytes, the internal framer switches to double-byte mode. When RF is held LOW, the reframing logic
is disabled. The incoming data stream is then continuously deserialized and decoded using byte
boundaries set by the internal byte counter. Bit errors in the data stream will not cause alias SYNC
characters to reframe the data erroneously.
Reference Clock. REFCLK is the clock frequency reference for the clock/data synchronizing PLL.
REFCLK sets the approximate center frequency for the internal PLL to track the incoming bit stream.
REFCLK must be connected to a crystal-controlled time base that runs within the frequency limits of
the Tx/Rx pair, and the frequency must be the same as the transmitter CKW frequency (within
CKW±0.1%)
Decoder Mode Select. The level on the MODE pin determines the decoding method to be used.
When wired to GND, MODE selects 8B/10B decoding. When wired to V
bypass the decoder and are sent to Q
V
test. In typical applications, MODE is wired to V
Built-In Self-Test Enable. When BISTEN is LOW the Receiver awaits a D0.0 (sent once per BIST loop)
character and begins a continuous test sequence that tests the functionality of the Transmitter, the Receiver,
and the link connecting them. In BIST mode the status of the test can be monitored with RDY and RVS outputs.
In normal use BISTEN is held HIGH or wired to V
Power for output drivers.
Power for internal circuitry.
Ground.
Description
CC
/2) the internal bit clock generator is disabled and INB becomes the bit rate test clock to be used for factory
CC
0−7
0−7
and the INB± pair may be used as a differential serial data input.
, SC/D, and RVS all switch synchronously with the rising edge of this output.
.
CC
CC
a−j
, then INB± can be used as differential line receiver inter-
, then INB± can be used as differential line receiver interchangeably
directly. When left floating (internal resistors hold the MODE pin at
CC
CC
or GND.
. BISTEN has the same timing as Q
CC
, registered shifter contents
j
output. RVS has the
0−7
CY7B9234
CY7B9334
.
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