cxd3220r Sony Electronics, cxd3220r Datasheet - Page 59

• Manufacturer Part Number: cxd3220r
• Description: Ieee1394 Link/transaction Layer Controller Lsi For Sbp-2
• Manufacturer: Sony Electronics

b) CXD3220R controlling
8-2-2. Request
The CXD3220R always uses serial communication of LREQ to send a request to Phy when a request to the
bus or access to the Phy register is required.
There are three types of request: Bus request, Read register request and Write register request. The timing
chart and contents are illustrated below.
a) Bus Request (Length of Stream: 7bit)
b) Read-Register Request (Length of Stream: 9bit)
c) Write-Register Request (Length of Stream: 17bit)
CTL [0:1]
8 to 15
1 to 3
1 to 3
4 to 7
1 to 3
4 to 7
4, 5
Bit
Bit
Bit
16
00
01
10
11
0
6
0
8
0
Start Bit
Request Type
Address
Data
Stop Bit
Idle
Hold
Transmit
Reserved
Start Bit
Request Type
Request Speed
Stop Bit
Start Bit
Request Type
Address
Stop Bit
Name
Name
Name
Name
LR0
The CXD3220R completed transmit.
The CXD3220R is holding the bus until transmit preparations are complete.
Or, the CXD3220R is trying to transmit another packet without Arbitration.
The CXD3220R is transmitting a packet to Phy.
Not used.
Transmit start bit. Always "1".
Indicates type of request. (Refer to Request Type table.)
Indicates request communication speed. (Refer to Request Speed table.)
Last transmit bit. Always "0".
Transmit start bit. Always "1".
Indicates type of request. (Refer to Request Type table.)
Address for Phy register read.
Last transmit bit. Always "0".
Transmit start bit. Always "1".
Indicates type of request. (Refer to Request Type table.)
Address for Phy register write.
Write data for Phy register specified by Address.
Last transmit bit. Always "0".
LR1
LR2
– 59 –
LR3
Description of Activity
Description
Description
Description
LR (n – 2)
LR (n – 1)
CXD3220R