Freescale Semiconductor MPC8260 11.3.6 Memory Data Register (MDR)

Memory Controller
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
11-28 Freescale Semiconductor
11.3.6 Memory Data Register (MDR)
The memory data register (MDR), shown in Figure11-12, contains data written to or read from the RAM
array for UPM READ or WRITE commands. MDR must be set up before issuing a write command to the
UPM.
10–12 G0CLx General line 0 control. Determines which address line can be output to the GPL0 pin when the
UPMx is selected to control the memory access.
000 A12
001 A11
010 A10
011 A9
100 A8
101 A7
110 A6
111 A5
13 GPL_x4DIS GPL_A4 output line disable. Determines if the UPMWAIT/GTA/GPL_4 pin behaves as an output
line controlled by the corresponding bits in the UPMx array (GPL4x).
0UPMWAIT/GTA
/GPL_x4 behaves as GPL_4.
UPMx[G4T4/DLT3] is interpreted as G4T4.
The UPMx[G4T3/WAEN] is interpreted as G4T3.
1UPMWAIT/GTA
/GPL_x4 behaves as UPMWAIT.
UPMx[G4T4/DLT3] is interpreted as DLT3.
UPMx[G4T3/WAEN] is interpreted as WAEN.
Note:Afte r a system reset, GP L_x4DIS = 1.
14–17 RLFx Read loop field. Determines the number of times a loop defined in the UPMx will be executed
for a burst- or single-beat read pattern or when M
x MR[OP] =11 (RUN command)
0001 The loop is executed 1 time
0010 The loop is executed 2 times
...
1111 The loop is executed 15 times
0000 The loop is executed 16 times
18–21 WLFx Write loop field. Determines the number of times a loop defined in the UPMx will be executed
for a burst- or single-beat write pattern.
0001 The loop is executed 1 time
0010 The loop is executed 2 times
...
1111 The loop is executed 15 times
0000 The loop is executed 16 times
22–25 TLFx Refresh loop field. Determines the number of times a loop defined in the UPMx will be executed
for a refresh service pattern.
0001 The loop is executed 1 time
0010 The loop is executed 2 times
...
1111 The loop is executed 15 times
0000 The loop is executed 16 times
26–31 MAD Machine address. RAM address pointer for the command executed. This field is incremented
by 1, each time the UPM is accessed and the OP field is set to WRITE or READ.
Table11-10. Machine x Mode Registers (M x MR) (continued)
Bits Name Description