2.0 Internal Registers
CX25870/871
2.4 Reading Registers
Flicker-Free Video Encoder with Ultrascale Technology
Table 2-4. Data Details Defined for Read-Only Registers
Bit Names
Data Definition
ID[2:0]
Indicates the part number of the Conexant VGA Encoder: 000 is returned from the Bt868, 001 is returned
from the Bt869, 010 is returned from the CX25870, and 011 is returned from the CX25871.
VERSION[4:0]
Version number; for Revision A of the CX25870/871, these bits are all 00000.
Revision C (25870/871-13) is denoted by 00001 of the CX25870/871.
Revision D (25870/871-14) is denoted by 00010 of the CX25870/871.
Revision E (25870/871-15) is denoted by 00011 of the CX25870/871.
MONSTAT_A
MONSTAT_B
MONSTAT_C
MONSTAT_D
CCSTAT_E
Monitor connection status for DACA output, 1 denotes monitor connected to DACA.
Monitor connection status for DACB output, 1 denotes monitor connected to DACB.
Monitor connection status for DACC output, 1 denotes monitor connected to DACC.
Monitor connection status for DACD output, 1 denotes monitor connected to DACD.
High if closed-caption data has been written for the even field; it is low immediately after the clock run-in on
the extended service line for the even field.
CCSTAT_O
High if closed-caption data has been written for the odd field; it is low immediately after the clock run-in on
the closed caption line for the odd field.
FIELD_CNT[3:0]
Field number, where 0000 indicates the first field, 1111 indicates the 15th field. An extra bit was added to
accommodate the SECAM standard.
SECAM
Indicates status of SECAM mode. If the encoder is outputting SECAM, this bit will be set to 1.
PLL reset state.
PLL_RESET_OUT
PLL_LOCK
FIFO_OVER
FIFO_UNDER
PAL
High when PLL is locked. Will be low if PLL loses lock.
Set to one if FIFO overflows. Reset on read.
Set to one if FIFO underflows. Reset on read.
Indicates status of PAL mode. If the encoder is outputting PAL, this bit will be set to 1. If the encoder is
transmitting NTSC, this bit is set to 0.
2-8
Conexant
100381B
CONEXANT [ CONEXANT SYSTEMS, INC ]
