cy28800 Cypress Semiconductor Corporation., cy28800 Datasheet - Page 9

• Manufacturer Part Number: cy28800
• Description: 100-mhz Differential Buffer For Pci Express And Sata
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-07723 Rev *B
Output Enable Clarification
OE functionality allows for enabling and disabling individual
outputs. OE_[7:0] are Active High or Active Low inputs
depending on the strapped value of the OE_INV input.
Disabling the outputs may be implemented in two ways, via
writing a ‘0’ to SMBus register bit corresponding to output of
interest or by deasserting the OE input pin. In both methods,
if SMBus registered bit has been written low or the OE pin is
deasserted or both, the output of interest will be tri-stated. (The
assertion and deassertion of this signal is absolutely
asynchronous.)
DIFC(Free Running
DIFT(Free Running
DIFC(Free Running
DIFC(Free Running
DIFT(Free Running
DIFT(Free Running
DIFC (Stoppable)
DIFT (Stoppable)
DIFC (Stoppable)
DIFC (Stoppable)
DIFT (Stoppable)
DIFT (Stoppable)
SRC_STP
SRC_STP
SRC_STP
PWRDWN
PWRDWN
PWRDWN
Figure 11. SRC_STP = Tri-state, PWRDWN = Tri-state, OE_INV = 1
Figure 10. SRC_STP = Tri-state, PWRDWN = Driven, OE_INV = 1
Figure 9. SRC_STP = Driven, PWRDWN = Driven, OE_INV = 1
Table 6. OE Functionality
OE_INV
0
0
0
0
1
1
1
1
OE (Pin)
0
0
1
1
0
0
1
1
OE (SMBus Bit)
0
1
0
1
0
1
0
1
1 ms
1 ms
1 ms
CY28800
Page 9 of 16
DIF[T/C]
Tri-State
Tri-State
Tri-State
Enabled
Tri-State
Enabled
Tri-State
Tri-State
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