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參數資料
| 型號： | AK4254VF |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Capacitor-less Video Amp with 7:2 Video Switch |
| 中文描述： | 電容器的視頻放大器以7:2視頻開關 |
| 文件頁數： | 15/22頁 |
| 文件大?。?/td> | 341K |
| 代理商： | AK4254VF |
ASAHI KASEI
[AK4254]
MS0586-E-01
2007/08
- 15 -
2-2. READ Operations
(2)-2. READ Operations
Set the R/W bit = “1” for the READ operation of the AK4254. After transmission of data, the master can read the next
address’s data by generating an acknowledge instead of terminating the write cycle after the receipt of the first data word.
After receiving each data packet the internal 2-bit address counter is incremented by one, and the next data is
automatically taken into the next address. If the address exceeds 01H prior to generating a stop condition, the address
counter will “roll over” to 00H and the previous data will be overwritten.
The AK4254 supports two basic read operations: CURRENT ADDRESS READ and RANDOM ADDRESS READ.
2-2-1. CURRENT ADDRESS READ
The AK4254 contains an internal address counter that maintains the address of the last word accessed, incremented by
one. Therefore, if the last access (either a read or write) were to address n, the next CURRENT READ operation would
access data from the address n+1. After receipt of the slave address with R/W bit set to “1”, the AK4254 generates an
acknowledge, transmits 1-byte of data to the address set by the internal address counter and increments the internal
address counter by 1. If the master does not generate an acknowledge to the data but instead generates a stop condition,
the AK4254 ceases transmission.
SDA
Slave
Address
S
S
T
A
R
T
R/W = "1"
A
C
K
A
C
K
Data(n+1)
A
C
K
Data(n+2)
A
C
K
A
C
K
Data(n+x)
A
C
K
P
S
T
O
P
Data(n)
Figure 10. CURRENT ADDRESS READ
2-2-2. RANDOM ADDRESS READ
The random read operation allows the master to access any memory location at random. Prior to issuing the slave address
with the R/W bit set to “1”, the master must first perform a “dummy” write operation. The master issues a start request, a
slave address (R/W bit = “0”) and then the register address to read. After the register address is acknowledged, the master
immediately reissues the start request and the slave address with the R/W bit set to “1”. The AK4254 then generates an
acknowledge, 1 byte of data and increments the internal address counter by 1. If the master does not generate an
acknowledge to the data but instead generates a stop condition, the AK4254 ceases transmission.
SDA
Slave
Address
S
S
T
A
R
T
R/W = "0"
A
C
K
A
C
K
A
C
K
Data(n)
A
C
K
Data(n+x)
A
C
K
P
S
T
O
P
Sub
Address(n)
S
Slave
Address
R/W = "1"
S
T
A
R
T
Data(n+1)
A
C
K
A
C
K
Figure 11. RANDOM ADDRESS READ
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