SAA7108AE Datasheet, PDF (91/208 Pages) NXP Semiconductors – HD-CODEC

NXP Semiconductors
SAA7108AE; SAA7109AE
HD-CODEC
Table 41. Signals dedicated to the expansion port …continued
Symbol Pin
I/O Description
Bit
XRH N2
I/O horizontal reference signal for the X port: XRHS[13h[6]],
as output: HREF or HS from the decoder XFDH[92h[6]] and
(see Figure 35); as input: a reference edge XDH[92h[2]]
for horizontal input timing and a polarity for
input field ID detection can be defined
XRV L5
I/O vertical reference signal for the X port: as XRVS[1:0] 13h[5:4],
output: V123 or field ID from the decoder XFDV[92h[7]] and
(see Figure 33 and Figure 34); as input: a XDV[1:0] 92h[5:4]
reference edge for vertical input timing and
for input field ID detection can be defined
XTRI K1
I port control: switches X port input to
3-state
XPE[1:0] 83h[1:0]
10.4.1 X port configured as output
If the data output is enabled at the expansion port, then the data stream from the decoder
is presented. The data format of the 8-bit data bus is dependent on the chosen data type,
selectable by the line control registers LCR2 to LCR24; see Table 20. In contrast to the
image port, the sliced data format is not available on the expansion port. Instead, raw
CVBS samples are always transferred if any sliced data type is selected.
Some details of data types on the expansion port are as follows:
• Active video (data type 15): contains component Y-C_B-C_R 4 : 2 : 2 signal, 720 active
pixels per line. The amplitude and offsets are programmable via DBRI7 to DBRI0,
DCON7 to DCON0, DSAT7 to DSAT0, OFFU1, OFFU0, OFFV1 and OFFV0. The
nominal levels are illustrated in Figure 27.
• Test line (data type 6): is similar to the active video format, with some constraints
within the data processing:
– Adaptive chrominance comb filter, vertical filter (chrominance comb filter for NTSC
standards, PAL phase error correction) within the chrominance processing are
disabled
– Adaptive luminance comb filter, peaking and chrominance trap are bypassed within
the luminance processing
This data type is defined for future enhancements. It could be activated for lines
containing standard test signals within the vertical blanking period. Currently most
sources do not contain test lines. The nominal levels are illustrated in Figure 27.
• Raw samples (data types 0 to 5 and 7 to 14): C_B-C_R samples are similar to data
type 6, but CVBS samples are transferred instead of processed luminance samples
within the Y time slots.
The amplitude and offset of the CVBS signal is programmable via RAWG7 to RAWG0
and RAWO7 to RAWO0; see Section 11, Table 167 and Table 168. The nominal levels
are illustrated in Figure 28.
The relationship of LCR programming to line numbers is described in Section 9.2,
Figure 31 and Figure 32.
SAA7108AE_SAA7109AE_3
Product data sheet
Rev. 03 — 6 February 2007
© NXP B.V. 2007. All rights reserved.
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