RELEASED
PM7383 FREEDM-32A256
DATASHEET
PMC-2010336
ISSUE 1
FRAME ENGINE AND DATA LINK MANAGER 32A256
supports the validation of both CRC-CCITT and CRC-32 frame check
sequences.
Sꢀ For each channel, the receiver checks for packet abort sequences, octet
aligned packet length and for minimum and maximum packet length. The
receiver supports filtering of packets that are larger than a user specified
maximum value.
Sꢀ Alternatively, for each channel, the receiver supports a transparent mode
where each octet is transferred transparently on the receive APPI. For
channelised links, the octets are aligned with the receive time-slots.
Sꢀ For each channel, time-slots are selectable to be in 56 kbits/s format or 64
kbits/s clear channel format.
Sꢀ 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 external controller or automatically when the channel underflows.
Sꢀ Alternatively, for each channel, the transmitter supports a transparent mode
where each octet is inserted transparently from the transmit APPI. For
channelised links, the octets are aligned with the transmit time-slots.
Sꢀ Supports per-channel configurable APPI burst sizes of up to 256 bytes for
transfers of packet data.Provides 32 Kbytes of on-chip memory for partial
packet buffering in both the transmit and the receive directions. This memory
may be configured to support a variety of different channel configurations
from a single channel with 32 Kbytes of buffering to 256 channels, each with a
minimum of 48 bytes of buffering.
Sꢀ Provides a 16 bit microprocessor interface for configuration and status
monitoring.
Sꢀ Provides a standard 5 signal P1149.1 JTAG test port for boundary scan board
test purposes.
Sꢀ Supports 5 Volt tolerant I/O (except APPI).
Sꢀ Low power 2.5 Volt 0.25 ꢁm CMOS technology.
PROPRIETARY AND CONFIDENTIAL
2
PMC [ PMC-SIERRA, INC ]
