Processor Local Bus Functional Model Toolkit User's Manual
Processor Local Bus Functional Model Toolkit User's Manual
Processor Local Bus Functional Model Toolkit User's Manual
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7.6 Back-to-Back Read - Write - Read - Write Transfers<br />
Figure 13 shows the operation of several back-to-back single read and write transfers on the PLB.<br />
Cycle<br />
SYS_plbClk<br />
Transfer Qualifiers<br />
Mn_request<br />
Mn_priority(0:1)<br />
Mn_busLock<br />
Mn_RNW<br />
Mn_BE(0:3)<br />
Mn_size(0:3)<br />
Mn_type(0:2)<br />
Mn_abort<br />
Mn_A<strong>Bus</strong>(0:31)<br />
PLB_PAValid<br />
Sl_AddrAck<br />
Sl_wait<br />
Write Data <strong>Bus</strong><br />
Mn_wrD<strong>Bus</strong>(0:31)<br />
Sl_wrDAck<br />
Sl_wrComp<br />
Mn_wrBurst<br />
Read Data <strong>Bus</strong><br />
Sl_rdD<strong>Bus</strong>(0:31)<br />
Sl_rdWdAddr(0:3)<br />
Sl_rdDAck<br />
Sl_rdComp<br />
Mn_rdBurst<br />
Figure 13. Back-to-Back Read - Write - Read - Write<br />
Set_device (path=/plb_complex/plb_master0,device_type=plb_master)<br />
mem_init(addr=00000000,data=00010203)<br />
mem_init(addr=00000004,data=04050607)<br />
mem_init(addr=00000008,data=08090a0b)<br />
mem_init(addr=0000000c,data=0c0d0e0f)<br />
read(addr=00000000,size=0000,be=1111)<br />
write(addr=00000004,size=0000,be=1111)<br />
read(addr=00000008,size=0000,be=1111)<br />
0 1 2 3 4 5 6 7 8 9<br />
1 2 3 4<br />
valid valid valid valid<br />
1111 1111 1111 1111<br />
0000 0000 0000 0000<br />
000 000 000 000<br />
A1 A2 A3 A4<br />
0000<br />
0000<br />
1 2 3 4<br />
1 2 3 4<br />
D(A2) D(A4)<br />
1<br />
2<br />
1 3<br />
3<br />
4<br />
2 4<br />
D(A1) 0000 D(A3) 0000<br />
0000 0000<br />
Version 4.9.2 PLB <strong>Bus</strong> Timing 61
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