HD64570F Renesas Electronics America, HD64570F Datasheet - Page 50
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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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD64570F
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Company:
Part Number:
HD64570F16
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Part Number:
HD64570F16
Manufacturer:
HITACHI/日立
Quantity:
20 000
Company:
Part Number:
HD64570F16V
Manufacturer:
INFINEON
Quantity:
12 000
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1.7.11
Figure 1.22 shows the structure of a descriptor. Descriptors are allocated in memory in different
ways, depending on the CPU mode.
Note:
Rev. 0, 07/98, page 34 of 453
Address
2n + 9
2n + 7
2n + 5
2n + 3
2n + 1
Address
2n + 8
2n + 6
2n + 4
2n + 2
2n
Reserved fields in descriptors are not written by the DMAC, but retain their previous
values. The MPU may write in these fields, but this does not affect the DMAC.
Descriptors must start at an even address (2n). Correct operation is not assured if a
descriptor starts at an odd address.
Descriptor Structure
Bit 15
Bit 15
Buffer pointer H (BPH)
Chain pointer H (CPH)
Buffer pointer H (BPH)
Chain pointer H (CPH)
Data length H (DLH)
Data length H (DLH)
Address
2n + 9
2n + 8
2n + 7
2n + 6
2n + 5
2n + 4
2n + 3
2n + 2
2n + 1
2n
Reserved
Reserved
Reserved
Reserved
Figure 1.22 Descriptor Structure
Bit 7
1. CPU Mode 1
2. CPU Mode 0
3. CPU Modes 2, 3
Buffer pointer H (BPH) 8 bits
Chain pointer H (CPH) 8 bits
Buffer pointer B (BPB) 8 bits
Buffer pointer L (BPL) 8 bits
Chain pointer L (CPL) 8 bits
Data length H (DLH) 8 bits
(Note)
(Note)
Data length L (DLL) 8 bits
(Note)
(Note)
Status (ST) 8 bits
Bit 8
Bit 8
Reserved
Reserved
Bit 7
Bit 7
Buffer pointer B (BPB)
Buffer pointer B (BPB)
Buffer pointer L (BPL)
Chain pointer L (CPL)
Buffer pointer L (BPL)
Chain pointer L (CPL)
(Note)
(Note)
Data length L (DLL)
Data length L (DLL)
Status (ST)
Status (ST)
Bit 0
Bit 0
Bit 0
Address
2n + 8
2n + 6
2n + 4
2n + 2
2n
Address
2n + 9
2n + 7
2n + 5
2n + 3
2n + 1
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