Texas-instruments TMS320C64x DSP Uživatelský manuál Strana 223

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Video Display Registers
Video Display Port4-78 SPRU629
4.12.16 Video Display Horizontal Synchronization Register (VDHSYNC)
The video display horizontal synchronization register (VDHSYNC) controls
the timing of the horizontal synchronization signal. The VDHSYNC is shown
in Figure 454 and described in Table 421.
Generation of the horizontal synchronization is shown in Figure 45,
page 4-6. The HSYNC signal is asserted to indicate the start of the horizontal
sync pulse whenever the frame pixel counter (FPCOUNT) is equal to HSYNC-
START. The HSYNC signal is deasserted to indicate the end of the horizontal
sync pulse whenever FPCOUNT = HSYNCSTOP.
Figure 454. Video Display Horizontal Synchronization Register (VDHSYNC)
31 28 27 16
Reserved
HSYNCSTOP
R-0 R/W-0
15 12 11 0
Reserved
HSYNCSTART
R-0 R/W-0
Legend: R = Read only; R/W = Read/Write; -n = value after reset
Table 421. Video Display Horizontal Synchronization Register (VDHSYNC)
Field Descriptions
Bit field
symval
Value Description
3128 Reserved 0 Reserved. The reserved bit location is always read as 0.
A value written to this field has no effect.
2716 HSYNCSTOP OF(value) 0FFFh Specifies the pixel where HSYNC is deasserted.
1512 Reserved 0 Reserved. The reserved bit location is always read as 0.
A value written to this field has no effect.
110 HSYNCSTART OF(value) 0FFFh Specifies the pixel where HSYNC is asserted.
For CSL implementation, use the notation VP_VDHSYNC_field_symval
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