9 of 49 September 28, 2011
IDT 89HPES64H16 Data Sheet
GPIO[29] I/O General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
GPIO[30] I/O General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
GPIO[31] I/O General Purpose I/O.
This pin can be configured as a general purpose I/O pin.
Alternate function pin name: IOEXPINTN10
Alternate function pin type: Input
Alternate function: SMBus I/O expander interrupt 10
Signal Type Name/Description
CCLKDS I Common Clock Downstream. When the CCLKDS pin is asserted, it indicates that a
common clock is being used between the downstream device and the downstream
port.
CCLKUS I Common Clock Upstream. When the CCLKUS pin is asserted, it indicates that a
common clock is being used between the upstream device and the upstream port.
MSMBSMODE I Master SMBus Slow Mode. The assertion of this pin indicates that the master SMBus
should operate at 100 KHz instead of 400 KHz. This value may not be overridden.
P01MERGEN I Port 0 and 1 Merge. P01MERGEN is an active low signal. It is pulled low internally via
a 251K ohm resistor.
When this pin is low, port 0 is merged with port 1 to form a single x8 port. The Serdes
lanes associated with port 1 become lanes 4 through 7 of port 0. When this pin is
high, port 0 and port 1 are not merged, and each operates as a single x4 port.
P23MERGEN I Port 2 and 3 Merge. P23MERGEN is an active low signal. It is pulled low internally via
a 251K ohm resistor.
When this pin is low, port 2 is merged with port 3 to form a single x8 port. The Serdes
lanes associated with port 3 become lanes 4 through 7 of port 2. When this pin is
high, port 2 and port 3 are not merged, and each operates as a single x4 port.
P45MERGEN I Port 4 and 5 Merge. P45MERGEN is an active low signal. It is pulled low internally via
a 251K ohm resistor.
When this pin is low, port 4 is merged with port 5 to form a single x8 port. The Serdes
lanes associated with port 5 become lanes 4 through 7 of port 4. When this pin is
high, port 4 and port 5 are not merged, and each operates as a single x4 port.
P67MERGEN I Port 6 and 7 Merge. P67MERGEN is an active low signal. It is pulled low internally via
a 251K ohm resistor.
When this pin is low, port 6 is merged with port 7 to form a single x8 port. The Serdes
lanes associated with port 7 become lanes 4 through 7 of port 6. When this pin is
high, port 6 and port 7 are not merged, and each operates as a single x4 port.
P89MERGEN I Port 8 and 9 Merge. P89MERGEN is an active low signal. It is pulled low internally via
a 251K ohm resistor.
When this pin is low, port 8 is merged with port 9 to form a single x8 port. The Serdes
lanes associated with port 9 become lanes 4 through 7 of port 8. When this pin is
high, port 8 and port 9 are not merged, and each operates as a single x4 port.
P1011MERGEN I Port 10 and 11 Merge. P67MERGEN is an active low signal. It is pulled low internally
via a 251K ohm resistor.
When this pin is low, port 10 is merged with port 11 to form a single x8 port. The
Serdes lanes associated with port 11 become lanes 4 through 7 of port 10. When this
pin is high, port 10 and port 11 are not merged, and each operates as a single x4 port.
Table 5 System Pins (Part 1 of 2)
Signal Type Name/Description
Table 4 General Purpose I/O Pins (Part 4 of 4)
