66 Design Guide
Intel
®
31244 PCI-X to Serial ATA Controller
Terminations: Pull-down/Pull-ups
TEST0 Connect to GND
TOUT NC
32BITPCI# 1K pull-up for 64 bit
Controls status bit 16, in the PCI-X Status Register. When
pulled down, reports a 0, for a 32-bit bus. When pulled up,
reports 1, a 64-bit device.
DPA_MODE#
GND to enable DPA
Mode
1K pull-up to enable legacy mode.
SSCEN Connect to GND
TX0P, TX0N, TX1P,
TX1N,TX2P,TX2N
RX0P, RX0N, RX1P,
RX1N,RX2P,RX2N
series 0.01uF capacitor
TRST#, TDI#, TMS#,
TCK
4.7K pull-up
P_SERR# 10 K pull-up
2
P_TRDY# 10 K pull-up
2
P_LOCK# 10 K pull-up
2
P_PERR# 10 K pull-up
2
P_DEVSEL# 10 K pull-up
2
P_FRAME# 10 K pull-up
2
P_STOP# 10 K pull-up
2
P_IRDY# 10 K pull-up
2
P_INTA# 10 K pull-up
2
P_INTB# 10 K pull-up
2
P_INTC# 10 K pull-up
2
P_INTD# 10 K pull-up
2
P_AD[63:32] 10 K pull-up
2
P_C/BE[7:4]# 10 K pull-up
2
P_PAR64 10 K pull-up
2
P_REQ64# 10 K pull-up
2
P_ACK64# 10 K pull-up
2
NOTES:
1. Pull-up only when PCI bus is to operate at 66 MHz and not already pulled up by system board. This signal
is grounded for 33 MHz operation. It is advisable to connect M66EN to a 0.01 µF capacitor located with-in
0.25 inches of the M66EN pin on a add-in connector.
2. Pull-up only when not already pulled up on PCI bus. An add-in card may rely on the motherboard to pull-up
these values.
3. PCI/XCAP - The maximum trace length between the resistor (when installed), capacitor, and the connector
contact is 0.25 inches. The maximum trace length between the resistor (when installed), capacitor, and
ground is 0.1 inches. A PCI-X card is not permitted to connect PCI/XCAP to anything else including supply
voltages and device input and output pins.
Table 30. Terminations: Pull-up/Pull-down (Sheet 2 of 2)
Signal Name Pull-up or Pull-down Comments
