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)： 49/130頁
文件大?。?/td> 881K
代理商： GT-64111
GT-64111 System Controller for RC4640, RM523X and VR4300 CPUs
Revision 1.0
4.1.1
CPU/Local Master Side Decoding Process
Decoding on the CPU/Local Master side starts with the SysAD address being compared with the values in the various
CPU/Local Master Low and High decoder registers. For example, the RAS[1:0] CPU/Local Master High and Low
decoder registers set the address range in which the Ras0* and Ras1* signals are active (i.e. where DRAM banks 0
and 1 are located.) The comparison works as follows:
Bits 31:28 of the SysAD address are compared against bits 10:7 in the various CPU/Local Master Low decode
registers. These values much match exactly. This effectively sets a 256 Mbyte “page” for the resource group.
Bits 27:21 of the SysAD address are then compared against bits 6:0 in the various CPU/Local Master Low
decode registers. The value of the SysAD bits must be greater than or equal to the Low decode value. This
sets the lower boundary for the region.
Bits 27:21 of the SysAD address are then compared against the High decode registers. The value of the
SysAD bits must be less than or equal to this value. This sets the upper bound for the region.
If all of the above are true, then the resource group is selected and a subdecode is perfomed to determine the
specific resource.
Once a CPU/Local Master resource group has been decoded, it must be subdecoded to determine which physical
device should be accessed within that group. This decoding is controlled by the device Low and High decode registers.
The comparison works as follows:
Bits 27:20 of the SysAD address are then compared against the relevant device Low decode registers. The
value of the SysAD bits must be greater than or equal to the Low decode value. This sets the lower boundary
for the sub-decode region.
Bits 27:20 of the SysAD address are then compared against the relevant device High decode registers. The
value of the SysAD bits must be less than or equal to this value. This sets the upper bound for the sub-decode
region.
If all of the above are true, then the specific device is selected and an access to that device is performed.
Examples of the CPU/Local Master-side decode process are shown in Figure 6 and Figure 7.
相關(guān)PDF資料
PDF描述
GT-96100A Advanced Communication Controller That Handles a Wide Range of Serial Communication Protocols,such as Ethernet,Fast Ethernet,and HDLC(通信協(xié)議的高級通信協(xié)議（以太網(wǎng)、快速以太網(wǎng)、HDLC）控制器)
GT5-2/1S-HU RECTANGULAR CONNECTOR
GT5-1S-HU(A) RECTANGULAR CONNECTOR
GT5-1S-HU(B) RECTANGULAR CONNECTOR
GT5-2S-HU RECTANGULAR CONNECTOR
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