參數(shù)資料
型號(hào): ARM966E-S
英文描述: ARM966E-S Microprocessor Core preliminary technical manual 6/01
中文描述: ARM966E - ?微處理器核的初步技術(shù)手冊(cè)6月1日
文件頁數(shù): 77/166頁
文件大?。?/td> 1145K
代理商: ARM966E-S
AHB Interface Signals
Rev. A
5-7
Copyright 1999-2001 by LSI Logic Corporation. All rights reserved.
Not all bus masters can generate accurate protection information
because they do not contain sufficient information about the nature of the
transfer. Therefore slaves should not use HPROT[3:0] unless absolutely
necessary.
5.2.3.4 HREADY
HREADY is used to extend the data portion of an AHB transfer. When
LOW, HREADY indicates the transfer is to be extended; when HIGH,
HREADY indicates the transfer can complete. A typical slave uses
HREADY to insert the appropriate number of wait states into the transfer.
To ensure accurate bus access latency, every slave must have a
predetermined number of wait states it inserts before backing off the bus.
It is recommended that slaves do not insert more than 16 wait states to
prevent any single access locking the bus for a large number of clock
cycles.
5.2.3.5 HRESP[1:0]
The HRESP[1:0] signals indicate the transfer response: OKAY, ERROR,
SPLIT, or RETRY.
When the transfer completes with an OKAY response on HRESP[1:0],
the transfer was successfully completed. The OKAY response is also
Table 5.4
Protection Signal Encoding
HPROT3
Cacheable
HPROT2
Bufferable
HPROT1
Supervisor
HPROT0
Data/Opcode
Description
0
Opcode Fetch
1
Data Access
0
User Access
1
Supervisor Access
0
Not Bufferable
1
Bufferable
0
Not Cacheable
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