HD64570F Renesas Electronics America, HD64570F Datasheet - Page 278
HD64570F
Manufacturer Part Number
HD64570F
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F.pdf
(469 pages)
Specifications of HD64570F
Applications
ISDN
Interface
Serial
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Buffer Pointer (BP) (24 Bits): Specifies the start address of the buffer corresponding to the
descriptor. The BP value is loaded into the buffer address register (BAR) at the start of transfer or
at buffer switching.
Data Length (DL) (16 Bits): Specifies the data length in the buffer corresponding to the
descriptor in byte units. The DL value is loaded into the byte count register (BCR) at the start of
transfer or at buffer switching.
This field is controlled by the MPU in memory-to-MSCI chained-block transfer mode.
Status (ST) (8 Bits): Indicates a frame transfer end or DMA transfer end for buffer data
corresponding to the descriptor.
This field is controlled by the MPU in memory-to-MSCI chained-block transfer mode.
ST configuration for memory-to-MSCI chained-block transfer mode (transmission) is shown in
table 6.1.
Table 6.1
Bit
7
6
5
4
3
2
1
0
Note: Status bits 6–1 are not used in memory-to-MSCI chained-block transfer mode.
The functions of bit 7 and bit 0 are described below.
Bit 7 (EOM: End of Message): Indicates whether or not a frame transfer ends in the buffer
corresponding to the descriptor.
EOM = 0: Indicates that no frame ends in the buffer corresponding to the descriptor
EOM = 1: Indicates that a frame ends in the buffer corresponding to the descriptor
Bit 0 (EOT: End of Transfer): Specifies whether or not to terminate DMA transfer after the
current frame is transferred in multi-frame transfer mode.
EOT = 0: Does not terminate transfer
Rev. 0, 07/98, page 262 of 453
Function
EOM
Not used
Not used
Not used
Not used
Not used
Not used
EOT
Status Configuration (transmission)
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