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MC92460 FEATURES

Major features of the MC92460 include:

? Controllers

– Maximum throughput of up to 1.9 Gbps; individual

controllers operating up to 66.7 Mbps

– All communication controllers operating in

asynchronous mode

? HDLC channels

– 40 dedicated full-duplex HDLC channels

– Each HDLC channel supporting a maximum of 66.7 Mbps

– A default of 64 buffer descriptors per channel

(32 TxBD plus 32 RxBD) or 4096 total buffer descriptors

– Configurable number of buffer descriptors in each

channel (minimum of 0, maximum of 4096)

? Buffering

– 32 kB on-chip dual-port RAM for buffer descriptors

– A default of 64 buffer descriptors per channel

(32 TxBD plus 32 RxBD) or 4096 total buffer descriptors

– 256 kilobits on-chip memory for data buffers

– 256-kilobit communication buffer storing up to

819 bytes per frame

– Maximum buffer length of 64 kB

– 80-channel virtual DMA functionality executing between

off-chip memory and the communications buffer

? Framing

– Programmable frame size (maximum 64 kB)

– Flexible buffers and multiple buffers per frame

– Separate interrupts for frames and buffers (Tx and Rx)

– Received frames threshold to reduce interrupt overhead

– Flag/abort/idle generation and detection

– Zero insertion and deletion

– 16- or 32-bit CRC-CCITT generation and checking

– Detection of non-octet aligned frames

– Detection of too-long frames

– Programmable flags (0–15) between

successive frames

– Echo and local loopback mode for testing

? Master interface unit

– Directly connects with 64-bit data, 32-bit

address 60x bus

– Supports 66 MHz 60x bus speed

– Virtual DMA supports an 80-channel HDLC master

– Virtual DMA functionality executing off-chip

memory to internal memory

– Either the master or the slave MC92460 may

be selected as the 60x bus master

– Bus supports multimaster design

– Up to four devices may be connected in

parallel on the 60x bus

– Supports single-beat and burst accesses

? Baud rate generator (BRG)

– 40 independent and identical baud rate generators,

one per channel

– On-chip PLL for configurable baud rate generation (maximum of 66.7 MHz)

– A 16x divider option allows slow baud rates at high system frequencies

– Each BGR output can be routed

to a pin (TxCKn and RxCKn)

– On-the-fly changes allowed

? 480-pin TBGA, 1.27 mm

pitch packaging

? Applications

– Supports IEEE1149.1 JTAG

controller standard

– Separate power supplies for

core (1.8 volts) and internal

logic (3.3 volts)