STLC5466 STMicroelectronics, STLC5466 Datasheet - Page 73

• Manufacturer Part Number: STLC5466
• Description: RF Wireless Misc Multi-HDLC Sw Matrix
• Manufacturer: STMicroelectronics
• Type: Telecom ICr

Specifications of STLC5466

• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-176
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

VII.2.3 - Receive Buffer
Each receive buffer is defined by its receive descriptor.
The maximum size of the buffer is 2048 words (1 word=2 bytes)
VII.3 - Transmit Descriptor
This transmit descriptor is located in shared memory. The quantity of descriptors is limited by the memory
size only.
The 5 first words located in shared memory to TDA+00 from TDA+08 are written by the microprocessor
and read by the DMAC only. The 6th word located in shared memory in TDA+10 is written by the DMAC
only during the frame reception and read by the microprocessor.
NBT
TBA
TDA
NTDA : Next Transmit Descriptor Address. LSB of NTDA Low is at Zero mandatory.
VII.3.1 - Bits written by the Microprocessor only
BINT : Interrupt at the end of the frame or when the buffer is become empty.
TDA+00
TDA+02
TDA+04
TDA+06
TDA+08
TDA+10
FR
0
0
0
RBA + SOB-2
: Number of Bytes to be transmitted (up to 4096).
: Transmit Buffer Address. LSB of TBA Low is at Zero mandatory.
: Transmit Descriptor Address.
BINT = 1,
if EOF = 1 the DMAC generates an interrupt when the frame has been transmitted;
if EOF = 0 the DMAC generates an interrupt when the buffer is become empty.
BINT = 0, the DMAC does not generate an interrupt during the transmission of the frame.
ABT
RBA
1
1
1
BINT
CFT
15
OVF
0
1
0
BOF
ABT
14
FCRC
15
Last Location Available = Receive Buffer Address (RBA) + Size Of the Buffer (SOB-2)
0
0
1
Not used
UND
EOF
13
ABORT. The received frame has been aborted by the remote transmitter or the
local microprocessor.
OVERFLOW of FIFO. The received frame has been aborted.
The received frame had not an integer of bytes.
EOQ
Not used
12
Next Transmit Descriptor Address Low (16 bits)
Transmit Buffer Address Low (16 bits)
11
10
CRCC
Number of Bytes to be Transmitted (NBT)
9
First Buffer Location
PRI
8
Definition
7
6
NTBA High (8 bits)
5
TBA High (8 bits)
4
3
2
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