NEC UPD98413 User Manual page 56

(f) Pointer action
New pointer value
NDF enable
Positive frequency justification
Negative frequency justification
For the format of the pointer, see Figures 3-9 .
(g) Frequency Justification operation
When indication incr_ind(4 in Table 3-3) or decr_ind(5) has been received, the Frequency Justification
operation that identifies inversion of the I and D bits by majority is executed.
Note, however, that this operation is executed under the condition that incr_ind, decr_ind, and NDF_enable
have not been received in the past three frames.
indication is Inv_point. This condition can be invalidated by using the FJM1 bit of the MDPTRR register.
• incr_ind: Positive Justification
If it is detected that three or more I bits and up to two D bits of a new pointer are inverted with
NDF = Disable, the byte at pointer address 0 is not received as payload data.
• decr_ind: Negative Justification
If it is detected that up to two I bits and three or more D bits of a new pointer are inverted with
NDF = Disable, the H3 byte area is received as payload data.
Note: The indication condition of incr_ind and decr_ind can be changed to mach of 8 bits or more of the
10 bits I-bits and D-bits to either the increment and decrement indication by the FJM2 bit of the
MDPTRR register.
• The pointer value is changed to the specified new value after the Frequency Justification operation.
1
A1 ........ A1 A2 ........ A2 J0 ........ Z0
1
2
3
4
H1 ........ H1 H2 ........ H2 H3 ........ H3
5
6
7
8
9
56
CHAPTER 3 FUNCTIONAL OUTLINE
condition
Detect 3 × norm_point
Detect NDF_enable
Detect incr_ind
Detect decr_ind
12
37
36
522 ..... 522 523 ..... 523
Negative stuff byte Positive stuff byte
0 ............. 0
87 ......... 87
Fixed stuff byte
435 ..... 435
PRELIMINARY
Process
Change the current value
Change the current value
Increment the current value
Decrement the current value
If any of these indications has been received, the
1 .....
1
STS-12c SPE
NEC confidential and Proprietary
1080
608 ..... 608
782 ..... 782
781 ..... 781
86 ..... 86
521 ..... 521