FEATURES
The FREEDM-32P672 chip offers the following features:
• Single-chip multi-channel HDLC controller with a 66 MHz, 32-bit Peripheral Component Interconnect (PCI) 2.1 compatible bus for configuration, monitoring, and transfer of packet data.
• An on-chip DMA controller with scatter/ gather capabilities.
• Supports up to 672 bi-directional HDLC channels assigned to a maximum of 32 MVIP digital telephony buses (at 2.048 Mbit/s per link) or 8 H-MVIP buses (at 8.192 Mbit/s per link).
• Supports up to 672 bi-directional HDLC channels assigned to a maximum of 32 channelized T1/J1 or E1 links.
• The number of time-slots assigned to an HDLC channel is programmable from 1 to 24 (for T1/J1) and from 1 to 31 (for E1).
• Supports up to 32 bi-directional HDLC channels, each assigned to an unchannelized arbitrary-rate link, subject to a maximum aggregate link clock-rate of 64 MHz in each direction.
• Channels assigned to links 0 to 2 support a clock rate of up to 52 MHz. Channels assigned to links 3 to 31 support a clock rate of up to 10 MHz.
• In the special case, where no more than three high-speed links are used, the maximum aggregate link clock-rate is 156 MHz.
• Links configured for channelized T1/ J1/E1 or unchannelized operation support the gapped-clock method for determining time-slots, which is backwards compatible with the FREEDM-8 and FREEDM-32 devices.
• For each channel, the HDLC receiver supports programmable flag-sequence detection, bit de-stuffing, and frame-check sequence validation.
• The receiver supports the validation of both CRC-CCITT and CRC-32 frame-check sequences.
• For each channel, the HDLC transmitter supports programmable flag-sequence generation, bit stuffing and frame-check sequence generation.
• The transmitter supports the generation of both CRC-CCITT and CRC-32 frame-check sequences.
• The transmitter also aborts packets under the direction of the host, or automatically when the channel underflows.
• Provides 32 kbytes of on-chip memory for partial-packet buffering in both the transmit and receive directions.
• You can configure the on-chip memory to support different channel configurations: from a single channel with 32 kbytes of buffering, to 672 channels, each with a minimum of 48 bytes of buffering.
• Provides a standard five-signal P1149.1 JTAG test-port for boundary-scan board-test purposes.
• Supports 5 Volt tolerant I/Os for non-PCI signals. Supports 3.3 Volt PCI signaling environment.
• 329-pin plastic ball grid array (PBGA) package.

APPLICATIONS
Use the FREEDM-32P672 chip in the following applications:
• Remote Access Concentrators.
• Frame Relay/Multiservice Switches.
• Multiservice Access Concentrators.
• Internet/Edge Routers.