FEATURES
• High density HDLC controller ideal for Internet access, Frame Relay, and Multiservice Switch equipment supporting rates ranging from 56 Kbit/s to 52 Mbit/s.
• Supports 32 full-duplex and independently-timed links.
• Supports 32 full-duplex HDLC or transparent channels.
• Supports a TimePipe architecture that enables any physical link to be flexibly mapped to one or more HDLC channels.
• Provides 8 KB partial packet FIFO in each transmit and receive direction to compensate for PCI bus latency during data transfers. The 8 KB partial packet FIFO is arranged as 512 blocks of 16- byte buffers.
• The TimePipe architecture supports programmable assignment of partial packet buffers to HDLC channels.
• Two physical links can support up to 52 Mbit/s; the remaining 30 physical links can individually support up to 10 Mbit/s.
• Supports a mix of channelized and unchannelized links.
• The maximum aggregate clock rate is 64 MHz. When the device is interfaced to two T3 or HSSI links, the maximum aggregate clock rate is 104 MHz.
• For channelized operation, the channel assignment supports up to 24 timeslots for a T1 link and 31 timeslots for an E1 link. Timeslots assigned to a common HDLC channel can be noncontiguous.
• Performs flag delineation, bit destuffing, CRC verification using either CRC-32 or CRC-CCITT algorithm, and length checking on receive HDLC channels.
• Performs flag insertion, bit stuffing, and FCS calculation using either CRC-32 or CRC-CCITT algorithm and length checking on transmit HDLC channels.
• On the system side, provides a 33 MHz, 32-bit PCI 2.1 compatible bus interface.
• Implements efficient transmit and receive DMA controllers to support burst data transfers between partial packet FIFO and packet memory.
• Supports scatter-gather capabilities whereby a packet can span multiple buffers.
• Supports line-side loopback on a perlink basis and system-side loopback on a per-HDLC channel basis.
• Software-compatible with the PM7364 FREEDM-32.
• Provides a standard 5-signal P1149.1 JTAG test port for boundary scan test board purposes.
• Implemented in low power 3.3 V CMOS technology with 5 V-tolerant inputs.
• Packaged in a 272-pin Plastic Ball Grid Array (PBGA) package.

APPLICATIONS
• Ideal for applications requiring HDLC, PPP, and transparent protocol processing for physical links, such as T1, E1, T3, E3, xDSL, and HSSI.
• Frame-based Interfaces for Internet Access and Multiservice Switch equipment.
• FUNI or Frame Relay service interworking interfaces for ATM switches and multiplexers.