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Intel
®
IXP42X product line and IXC1100 control plane processors—High-Speed Serial
Interfaces
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
448 Order Number: 252480-006US
17.0 High-Speed Serial Interfaces
The functionality supported by the High-Speed Serial (HSS) interfaces are tightly
coupled with the code written on the Network Processor Engine (NPE) core. This
chapter details the full hardware capabilities of the HSS interfaces contained within the
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane
Processor. The features accessible by the user are described in the Intel
®
IXP400
Software Programmer’s Guide and may be a subset of the features described below.
Not all of the Intel
®
IXP42X product line and IXC1100 control plane processors have
this functionality. See Table 154.
The HSS coprocessor enables the IXP42X product line and IXC1100 control plane
processors to communicate in a Time Divisible Multiplexed (TDM) bit serial fashion with
external chips. The HSS interfaces are six-wire, serial interfaces that can operate at
speeds from 512 KHz to 8.192 MHz.
The NPEs core controls each HSS interface. By programming certain parameters to the
HSS interfaces — such as frame length/offset, frame signal polarity, and data
endianness — the interfaces can be configured to support a variety of bit serial
protocols.
For a list of supported protocols, see the Intel
®
IXP400 Software Programmer’s Guide.
17.1 High-Speed Serial Interface Receive Operation
Each High-Speed Serial Interface contains five receive FIFOs and four receive FIFOs
intended for facilitating the use of HDLC. Each is two 32-bit words in length. The four
receive FIFOs are further divided into two buffers, each one 32-bit word in length.
These FIFOs are hardware support added to facilitate the implementation of four HDLC
channels and do not preclude the implementation of more HDLC channels using the
Network Processor Engine core and the HDLC Co-processor connected.
The HSS interface will be filling one buffer while the NPE empties the other buffer. The
fifth receive FIFO is intended for voice-processing support and is four 32-bit words in
length. This receive FIFO is split into two buffers, each buffer two 32-bit words in
length.
Table 154. Processors with HSS
HSS
Intel
®
IXP425
Network
Processor
B Step
Intel
®
IXP423
Network
Processor
Intel
®
IXP422
Network
Processor
Intel
®
IXP421
Network
Processor
Intel
®
IXP420
Network
Processor
Intel
®
IXC1100
Control
Plane
Processor
HSS 0 X X X
HSS 1 X X X