- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
177
Adjustment of drive ability
Drive ability can be changed by the parameters shown in
“0[h]” is the maximum of drive ability and “6[h]” is the minimum of drive ability. (Common to each TG waveform)
When drive ability is set to "7[h]", each TG output terminal becomes high impedance. Therefore the pulse is
not outputted. As an example, when DRBH1 is changed, H1 waveform measured on a Sony evaluation board
is shown in
When drive ability is high, depending on substrate composition, the overshoot and the undershoot may
appears in TG waveform. Please adjust drive ability if you need.
Table 11.3-5 Drive ability adjustment parameter
Parameter
Description
DRBH1
CAT6_Byte15_bit4-6
Adjustment of H1 drive ability
DRBH2
CAT6_Byte16_bit0-2
Adjustment of H2 drive ability
DRBRG CAT6_Byte16_bit3-5
Adjustment of RG drive ability
DRBSHP
CAT6_Byte17_bit0-2
Adjustment of XSHP drive ability
DRBSHD
CAT6_Byte17_bit3-5
Adjustment of XSHD drive ability
DRBXRS
CAT6_Byte18_bit0-2
Adjustment of XRS drive ability
Fig 11.3-3 Drive ability adjustment
* This waveform was measured on a Sony evaluation board.
This waveform changes by circuit composition etc.
H1 waveform drive capability change
DRBH1=0[h]
DRBH1=5[h]
DRBH1=7[h]
Over shot
Under shot