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L9634

4.33 Diagnostic Mode

Diagnostic Mode message is defined as shown in table.

Table 25. MOSI Diagnostic Mode Message Definition

Odd parity check includes all 16 bits. "Don't care" bit is included in the parity check as well.

When bit D12 is set to '1,' OSD starts its internal diagnostics on any channels selected in bit D7 through

bit D0. When any of bit D7 through bit D0 are set to '1,' OSD performs diagnostics on the respective chan-

nels. The diagnostic sequence is shown in Figure 10. When bit D12 is set to '0,' OSD ignores bit D9

through bit D0.

Bit D9 and bit D8 are utilized to control the short between loops and MOS tests. If any of these bits are set

to '1,' OSD performs the respective tests to any channels as selected in bit D7 thorugh bit D0. OSD exe-

cutes these tests based on the diagnostic flow chart, shown in Figure 15.

Bit

State

Description

D15

1

Mode Bits

D14

0

D13

Odd Parity

D12

0

Read Status Response Only

1

Run On-chip Diagnostic

D11

-

Don’t Care

D10

-

Don’t Care

D9

0

Short Between Loops Test Disable

1

Short Between Loops Test Enable

D8

0

MOS Test Disable

1

MOS Test Enable

D7

0

Disable Channel 7 Diagnostic

1

Enable Channel 7 Diagnostic

D6

0

Disable Channel 6 Diagnostic

1

Enable Channel 6 Diagnostic

D5

0

Disable Channel 5 Diagnostic

1

Enable Channel 5 Diagnostic

D4

0

Disable Channel 4 Diagnostic

1

Enable Channel 4 Diagnostic

D3

0

Disable Channel 3 Diagnostic

1

Enable Channel 3 Diagnostic

D2

0

Disable Channel 2 Diagnostic

1

Enable Channel 2 Diagnostic

D1

0

Disable Channel 1 Diagnostic

1

Enable Channel 1 Diagnostic

D0

0

Disable Channel 0 Diagnostic

1

Enable Channel 0 Diagnostic

Obsolete

Product(s)

- Obsolete

Product(s)