SIS Documentation
SIS3820
VME Scaler
Page 47 of 79
7.30 JTAG_TEST register
#define SIS3820_JTAG_TEST 0x310 /* write; D32; */
This register is used in the firmware upgrade process over VME only. A TCK is generated
upon a write cycle to the register.
Bit write
Function
31 none
... ...
4 none
3 none
2 none
1 TMS
0 TDI
7.31 JTAG_DATA_IN register
#define SIS3820_JTAG_DATA_IN 0x310 /* read; D32; */
This register is used in the firmware upgrade process over VME only. It is at the same address
as the JTAG_TEST register and is used in read access. It operates as a shift register for TDO.
The contents of the register is shifted to the right by one bit with every positive edge of TCK
and the status of TDO is transferred to Bit 30. Bit 31 reflects the current value of TDO during
a read access.
7.32 JTAG_CONTROL register
#define SIS3820_JTAG_CONTROL 0x314 /* write only; D32;
*/
This register is used in the firmware upgrade process over VME only.
Bit write
Function
31 none
... ...
4 none
3 none
2 none
1 none
0
1: Enable JTAG output