mt90503 Zarlink Semiconductor, mt90503 Datasheet - Page 81

• Manufacturer Part Number: mt90503
• Description: 2048vc Aal1 Sar
• Manufacturer: Zarlink Semiconductor

4.5.4
Transmit and Receive State Machines for ATM and PHY Modes
Room for at
NOTE: PHY Mode Transmit and Receive refers to the direction
of cells as per the UTOPIA specification.
least 1 cell
No room
for 1 cell
53 bytes
sent
Cell available
Transmit State Machine
tx_clav=1
Discard
AND
tx_clav=1
Cell
rx_enb=0*
rx_soc=1
(tx_soc=1,
tx_enb=0)
(tx_soc=0,
tx_enb=0)
Next Byte
<53 Bytes
tx_clav=1
AND
Idle
Tx 1st
AND
Byte
Tx
53 bytes
received
<53 Bytes
tx_clav=1
rx_enb=0*
tx_clav=0
Transmit State Machine
rx_soc=1
tx_clav=0
rx_enb=0*
AND
AND
Room for
1 cell
(rx_clav=0)
(rx_clav=1)
Cell not available
Next Byte
rx_enb=0*
<53 Bytes
Rx 1st
Byte
AND
tx_clav=0
Idle
Idle
Rx
OR
Idle
rx_enb=1**
rx_enb=0*
<53 Bytes
rx_enb=1**
Figure 34 - ATM Mode State Machines
Figure 35 - PHY Mode State Machines
AND
rx_enb=1**
No room
for 1 cell
rx_soc=0
OR
tx_clav=0
Idle
Zarlink Semiconductor Inc.
MT90503
Room for at
rx_enb=1**
least 1 cell
No room
for 1 cell
81
Discard
Cell
rx_clav=1
rx_soc=1
AND
53 bytes
sent
Cell available
53 bytes
received
tx_enb=0*
tx_enb=0*
AND
Receive State Machine
rx_clav=1
rx_soc=1
Receive State Machine
AND
rx_clav=1
Room for
(tx_soc=1,
tx_clav=1)
(tx_soc=0,
tx_clav=1)
tx_enb=0*
Next Byte
<53 Bytes
1 cell
Idle
Tx 1st
AND
Byte
(rx_enb=0)
(rx_enb=1)
Next Byte
<53 Bytes
rx_clav=1
Tx
Rx 1st
Byte
AND
Idle
Idle
Rx
tx_enb=1**
tx_enb=0*
<53 Bytes
tx_enb=1**
AND
<53 Bytes
rx_clav=1
rx_clav=0
* If MPHY L2, add “AND rx_addr matches”
** If MPHY L2, add “OR rx_addr doesn’t match”
rx_clav=0
AND
Cell not available
tx_enb=1**
No room
for 1 cell
rx_clav=0
rx_soc=0
OR
OR
Idle
Idle
tx_enb=1**
rx_clav=0
Data Sheet