FS401LF datasheet(17/104 Pages) ETC2

17 / 104 page

FS401, FS403

PRODUCT SPECIFICATION

REV. NO. 1.7

JANUARY 24, 2007

4. Control Register Definitions

4.1 Control Register Functions

Control register functions are summarized in Table 3. Each internal register is up to 16-bits wide. To

access a register two 8-bit data words must be transferred. In the case of a write, writing the second byte

loads the internal 16-bit register. Most registers have type read/write. Read only registers access the

internal status of the FS400. Write-only registers initiate the transfer of data.

There are two methods for an external processor to control the FS400. The first is to directly program the

FS400 SIO hardware registers. The external processor would sample continuously the IHC and IVC

registers to monitor the size and speed of the input video. Additionally, it would read the SHV, EHV, SVV,

and EVV to determine the size of the active area of the input image (input calibration). Lastly, the

external processor would have to calculate the values for the ILS, VSC, IHS, IHA, HSC, OHO, and OVO

registers.

The second method is to allow the FS400’s internal micro-controller to do most of the required work. The

external processor writes to a set of high level registers (software registers) to direct the internal micro-

controller’s actions. The internal micro-controller takes care of all the real-time sampling and calculations

for the lower level registers (hardware registers).

When enabled, the internal micro-controller takes control of many of the hardware registers. These

registers are GPO, ILS, VSC, IVO, IHS, IHA, HSC, IHO, CR, CRE, OHO, OVO, SHV, EHV, SVV, EVV,

AVT, and FLK. The external processor should not write to these registers while the internal micro-

controller is enabled.

The internal micro-controller also provides high level registers (software registers). These registers are

described in the following sections. The interface the software registers is identical to the hardware

registers via the SIO.

Additionally, the external processor is allowed to write to the following hardware registers: CON, BRT,

SHP, and CSC.

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