L9663 datasheet(57/106 Pages) STMICROELECTRONICS

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DS11401 Rev 6

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L9663

Communication interface

105

UDB1_X (X = 1…4)

Upstream Data Buffer 1

Address:

001000 (UDB1_1) .. 001011 (UDB1_4)

Type:

R/W

Description:

UDB2_X (X = 1…4)

Upstream Data Buffer 2

Address:

001100 (UDB2_1) .. 001111 (UDB2_4)

Type:

R/W

Description:

Default value:

000

R/W

[15:0] UDB1_X (X = 1…4)

The Upstream Data Buffer 1 (4x 16 bits = 64 bits) contains the bits to be sent to sensors as

SYNC pulses on the PSI5 interface 1. The Upstream Data Buffer 1 is formed by the

concatenation of UDB1_1, UDB1_2, UDB1_3 and UDB1_4:UDB1_1 (bits [63:48]), UDB1_2

(bits [47:32]), UDB1_3 (bits [31:16]), UDB1_4 (bits [15:0]). Data are sent on the interface with

LSB first.

If the upstream data buffer is empty (UDBx_BUSY flag is set to '0'), when the trigger source

(SPI, SYNCx pin or timer) is active, a short sync pulse is generated on the interface by default

(independently from tooth gap or pulse width method selection).

Default value:

000

R/W

[15:0] UDB2_X (X = 1…4)

The Upstream Data Buffer 2 (4x 16 bits = 64 bits) contains the bits to be sent to sensors as

SYNC pulses on the PSI5 interface 2. The Upstream Data Buffer 2 is formed by the

concatenation of UDB2_1, UDB2_2, UDB2_3 and UDB2_4: UDB2_1 (bits [63:48]), UDB2_2

(bits [47:32]), UDB2_3 (bits [31:16]), UDB2_4 (bits [15:0]). Data are sent on the interface with

LSB first.

If the upstream data buffer is empty (UDBx_BUSY flag is set to '0'), when the trigger source

(SPI, SYNCx pin or timer) is active, a short sync pulse is generated on the interface by default

(independently from tooth gap or pulse width method selection).

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