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Datasheet, Volume 1 65
Signal Description
6 Signal Description
This chapter describes the processor signals. They are arranged in functional groups
according to their associated interface or category. The following notations are used to
describe the signal type.
The signal description also includes the type of buffer used for the particular signal
(see Table 6-1).
Note:
1. Qualifier for a buffer type.
Notations Signal Type
I Input Signal
OOutput Signal
I/O Bi-directional Input/Output Signal
Table 6-1. Signal Description Buffer Types
Signal Description
PCI Express*
PCI Express* interface signals. These signals are compatible with PCI Express* 3.0
Signalling Environment AC Specifications and are AC coupled. The buffers are not
3.3-V tolerant. Refer to the PCIe specification.
DMI
Direct Media Interface signals. These signals are compatible with PCI Express* 2.0
Signaling Environment AC Specifications, but are DC coupled. The buffers are not
3.3-V tolerant.
CMOS CMOS buffers.
DDR3 DDR3 buffers: 1.5-V tolerant
A
Analog reference or output. May be used as a threshold voltage or for buffer
compensation
Ref Voltage reference signal
Asynchronous
1
Signal has no timing relationship with any reference clock.