GS1500 Gennum Corporation, GS1500 Datasheet - Page 8

• Manufacturer Part Number: GS1500
• Description: Hd-linx (tm) THDTV Serial Digital Deformatter With Anc Fifos
• Manufacturer: Gennum Corporation

1.2 PIN DESCRIPTIONS
GENNUM CORPORATION
PIN NUMBER
106, 107, 108,
111, 112, 113,
114, 117, 118,
122, 123, 124,
119,120, 121,
103,104,105,
125, 126
100
101
102
92
95
96
97
98
99
DATA_IN [19:0]
ANC/DATA
ANC_Y/C
(Continued)
(Continued)
(Continued)
(Continued)
R_CLK
NAME
FM_I/E
FFRST
FOEN
EX/CP
WEN
REN
synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
wrt PCLK_IN
wrt PCLK_IN
synchronous
synchronous
wrt PCLK_IN
synchronous
wrt PCLK_IN
wrt R_CLK
TIMING
Non-
Non-
Non-
Non-
N/A
TYPE
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
8
Input Clock Signal. Used to read information from the internal
FIFO(s). On the rising edge of R_CLK, the device will extract the
next word from the internal LUMA/CHROMA channel data FIFO,
depending on the status of the ANC_Y/C signal.
Control Signal Input. Used to enable or disable the internal FIFO
outputs. When FOEN is low, the FIFO ANC_OUT[9:0] and
FF_STA[2:0] are enabled. When FOEN is high, the FIFO
ANC_OUT[9:0] and FF_STA[2:0] outputs are in a high Z state.
Note that the internal read address pointers are updated
independently of FOEN.
Control Signal Input. FFRST is used to supply synchronous reset
signals to the FIFO. When FFRST is low, the FIFO is reset and all
internal read and write address pointers are set to their starting
locations.
Control Signal Input. Used to enable or disable extracting data into
the internal FIFO. When WEN is low, extracting data into the internal
FIFO is enabled. When WEN is high, extracting data into the internal
FIFO is disabled.
Control Signal Input. Used to enable or disable reading data from the
internal FIFO. When REN is low, reading from the internal FIFO is
enabled. When REN is high, reading from the internal FIFO is
disabled.
Control Signal Input. Used to control copying of ANC data packets
into the internal FIFOs. When ANC/DATA is high, the device extracts/
copies only ANC data packets into the internal FIFO buffers. When
ANC/DATA is low, the device extracts/copies all data words within the
horizontal blanking period regardless of their status (i.e. ANC data or
not) and places these words into the internal FIFO buffers.
Control Signal Input. When FM_I/E is high, the device operates in a
mode where the FIFO reset and write enable signals are generated
internally. In this mode, the device limits the data extraction to the
HANC region of the video stream. The extracted ANC data are to be
accessed during the active video period using REN. When FM_I/E is
low, the device operates in another mode where the FIFO reset and
write enable signals are generated externally by the user and
supplied to the device via the FFRST and WEN control signal inputs.
Control Signal Input. Used to control extraction of ANC data from the
video data stream into the LUMA or CHROMA FIFO. When ANC_Y/C
is high, data is extracted from the luma data stream into the internal
LUMA FIFO. When ANC_Y/C is low, data is extracted from the chroma
data stream into the internal CHROMA FIFO.
Control Signal Input. Used to control if the ANC Data is extracted or
copied into the internal FIFO buffers. When EX/CP is high, the device
extracts ANC data from the incoming data stream into the internal
FIFO buffers and replaces any extracted words with appropriate
blanking levels. When EX/CP is low, the device makes a copy of
ANC data from the incoming data stream into the internal FIFO
buffers.
Input Data Bus. DATA_IN [19] is the MSB of the signal (pin 103).
DATA_IN [0] is the LSB of the signal (pin 126). This data is typically
scrambled and not word aligned.
DESCRIPTION
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