cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 105

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
Table 1-31. ESTATUS[1:0] Read-back Bit Map
100381B
NOTE(S):
ESTATUS
[1:0]
00
01
10
Descriptions of these bits are found in
MONSTAT_A
Reserved
7
MONSTAT_B
ID[2:0]
SECAM
is used and ESTATUS[1:0] = 10, 01, or 00.
the next transaction. In the read mode, when the CX25870/871 is driving the SID
port, an end to the transaction cannot take place until the encoder releases control
of the SID line. This event happens during the transition from when the last bit of
the register is output to the receiving of the ACK.
6
Table 1-31
5.
6.
7.
To reiterate, a START condition needs to be issued by the serial master to start
If ESTATUS = 01, the serial master should receive one byte of information
telling it the following information in this order:
a.
b.
c.
d.
e.
The serial master must issue a STOP condition to finish the Read
transaction. An ACK is not necessary before closing the transaction
because the CX25870 just ignores the ACK anyway. In reality, the
CX25870/871 does not really care about ending a transaction properly as
long as a proper START condition is used to start the next transaction. In
the read mode when the CX25870 is driving the SDA port, ending the
transaction cannot take place until the encoder releases control of the SID
line. This happens during the transition from when the last bit of the
register is output to the receiving of the ACK.
The graphics controller, acting as the serial master, should clear the
CHECK_STAT register bit back to 0 (bit D6 of register BA) by writing
zero to the CHECK_STAT register bit (bit D6 of register BA) to display
standard video again from the CX25870/871 VGA encoder.
PLL_RESET_O
MONSTAT_C
Monitor Connection Status for DACA output (MONSTAT_A = most
significant bit).
Monitor Connection Status for DACB output (MONSTAT_B).
Monitor Connection Status for DACC output (MONSTAT_C).
CCSTAT_E, CCSTAT_O.
FIELD2, FIELD1, FIELD0 (least significant bit). The FIELD[2:0] bits
indicate the field number that was last encoded. 000 indicates the 1st
field.
Table
summarizes the meaning of the read-back bits when the agency procedure
UT
5
2-4.
Conexant
PLL_LOCK
CCSTAT_E
4
FIFO_OVER
CCSTAT_O
3
VERSION[4:0]
UNDER
FIFO_
2
1.0 Functional Description
FIELD[2:0]
PAL
1.3 Device Description
1
RESERVED
0
1-89