s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 229

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

S3C4510B
THE MAC TRANSMIT BLOCK
The MAC transmit block is responsible for transmitting data. It complies with the IEEE802.3 standard for carrier
sense multiple access with collision detection (CSMA/CD) protocol. The MAC transmit block consists of the
following sections:
— Transmit FIFO and controllers
— Preamble and jam generators
— Pad generator
— Parallel CRC generator
— Threshold logic and counters
— Back-off and retransmit timers
— Transmit state machine
Figure 7-3 shows the MAC transmit function blocks in detail.
B
D
I
and PARITY
Tx_DB [7:0]
Tx_EOF
Tx_wr#
Tx_rdy
SYS_CLK Domain
and Counter
Write FIFO
Threshold
Controller
Logic and
Counters
9
Figure 7-3. MAC Transmit Function Blocks
Transmit
(80 x 9)
FIFO
MAC
Check
Parity
9
Tx_CLK Domain
Back off and
and Counter
Read FIFO
Retransmit
Controller
Generator
Timers
PAD
JAM generator
Preamble and
Generator
CRC
8
Transmit
Matchine
State
ETHERNET CONTROLLER
TxD [3:0]
Tx_CLK
Tx_en
Tx_er
CrS
Col
10
I/F
M
M
a
n
d
b
y
e
I
I
t
7-7