8.2.259 GMAC Express MAC 1588 Timer Increment Sub-nanoseconds Register
| Name: | GMAC_EMAC_TISUBN |
| Offset: | 0x11BC |
| Reset: | 0x00000000 |
| Property: | Read/Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| LSBTIR[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| MSBTIR[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| MSBTIR[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bits 31:24 – LSBTIR[7:0] Lower Significant Bits of Timer Increment Register
Lower significant bits of Timer Increment Register[15:0] giving a 24-bit timer_increment counter. These bits are the sub-ns value which the 1588 timer will be incremented each clock cycle. Bit n = 2(n-16) nsec giving a resolution of approximately 15.2E-15 sec.
Bits 15:0 – MSBTIR[15:0] Most Significant Bits of Timer Increment Register
Most significant bits [23:8] of the sub-nanosecond value by which the 1588 timer will be incremented each clock cycle. 24 bits of sub-nanosecond precision gives a resolution of approximately 5.86E-17 seconds.