參數(shù)資料
型號: GT-64111
廠商: Galileo Technology Services, LLC
英文描述: System Controller for RC4640, RM523X and VR4300 CPUs(用于RC4640, RM523X和 VR4300 CPUs的系統(tǒng)控制器)
中文描述: 系統(tǒng)控制器(用于RC4640,RM523X和VR4300處理器的系統(tǒng)控制器的RC4640,RM523X和VR4300處理器)
文件頁數(shù): 66/130頁
文件大小: 881K
代理商: GT-64111
GT-64111 System Controller for RC4640, RM523X and VR4300 CPUs
40
Revision 1.0
trollers, only single word reads are allowed.
5.2.9.1
8-Bit Devices
If a device bank is set to support 8-bit devices, and the CPU executes a 2 or 3 byte read, the device controller will fetch
extra data. If the CPU executes a 1 or 4 byte read, the device controller will not fetch extra data. See Table 17 for a
summary.
TABLE 17. Destructive Reads, 8-bit Device
5.2.10 Ready* Support
The Ready* pin is sampled on three occasions: one clock before the data is sampled to the GT-64111 during both
AccToFirst (see Figure 19) and AccToNext (see Figure 20) phases of read cycles and on the last rising edge of the
WrActive (see below) phase during a write cycle. During all other phases Ready* is not sampled by the GT-64111.
If Ready* is not asserted during these clocks, the WrActive, AccToFirst or AccToNext phases are extended until Ready*
is asserted again. The transaction may be indefinitely held off until Ready* is asserted.
# Byte Read from CPU
Destructive Read?
# of Additional Bytes Read
1No
0
2Yes
2
3Yes
1
4No
0
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