Power Down (PDN1, PDN0, PDN)
PDN1, PDN0 and PDN turn off internal circuitry of Main-Link and Sub-Link separately.
Table 2. Power Down Setting(THCV231)
PDN
Operation
0
1
Both Main-Link and Sub-Link power down
Both Main-Link and Sub-Link active
Table 3. Power Down Setting(THCV236)
PDN1
PDN0
Operation
0
0
1
1
0
1
0
1
Both Main-Link and Sub-Link power down
Only Main-Link is active
Only Sub-Link is active
Both Main-Link and Sub-Link active
Pre-emphasis and Drive Select Function (THCV231 only)
Pre-emphasis can equalize severe signal degradation caused by long-distance or high-speed transmission. PRE
register selects the strength of pre-emphasis. CMLDRV register controls CML Main-Link output swing level.
See Table 4.
Table 4. Pre-emphasis and Drive Select function table
Condition
Pre-emphasis Level
CMLDRV[1:0]
(register)
PRE
(register)
Swing Level
0
1
0
1
*
0dB
6dB
0dB
3.5dB
0dB
00
01
400mV diff p-p
600mV diff p-p
800mV diff p-p
10
11
*
Forbidden
Permanent Clock Output (THCV236 only)
When there is no input from Main-Link, the THCV236 will output internal oscillator clock from CLKOUT pin.
This function is controlled by OUTSEL pin or OUTSEL_ENABLE register and OUTSEL_SETTING register.
See Table 5.
Table 5. Permanent Clock Output function table (PDN1=1)
OUTSEL_
ENABLE
(register)
OUTSEL_
SETTING
(register)
Output Clock
Frequency(*1)
0
*
-
00
01
10
11
80MHz
40MHz(default)
20MHz
1
10MHz
*1 typical value
THCV231_THCV236_Rev.2.30_E
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