Datasheet

AD9548 Data Sheet
Rev. E | Page 72 of 112
Table 46. Nominal System Clock (SYSCLK) Period
1
Address Bits Bit Name Description
0x0103 [7:0] System clock period
(expressed in
femtoseconds)
System clock period, Bits[7:0]
0x0104 [7:0] System clock period, Bits[15:8]
0x0105 [7:5] Unused
[4:0]
System clock period
System clock period, Bits[20:16]
1
Units are femtoseconds. The default value is 0x0F424 = 1,000,000 (1 ns) and implies a system clock frequency of 1 GHz.
Table 47. System Clock Stability Period
1
Address Bits Bit Name Description
0x0106 [7:0] System clock stability
period
System clock stability period, Bits[7:0] (default = 0x01)
0x0107 [7:0] System clock stability period, Bits[15:8] (default = 0x00)
0x0108 [7:4] Unused
[3:0] System clock stability
period
System clock stability period, Bits[19:16] (default = 0x0)
(default period = 0x00001, or 1 ms)
1
Units are milliseconds. The default value is 0x000001 = 1 (1 ms).
GENERAL CONFIGURATION (REGISTER 0x0200 TO REGISTER 0x0214)
Register 0x0200 to Register 0x0207—Multifunction Pin Control (M0 to M7)
Table 48. Multifunction Pin (M0 to M7) Control
1
Address Bits Bit Name Description
0x0200 [7] M0 in/out In/out control for the M0 pin
0 (default) = input (control pin)
1 = output (status pin)
[6:0] M0 function See Table 25 and Table 26 (default = 0xb0000000)
0x0201 [7] M1 in/out In/out control for the M1 pin (same as M0)
[6:0] M1 function See Table 25 and Table 26 (default = 0xb0000000)
0x0202 [7] M2 in/out In/out control for the M2 pin (same as M0)
[6:0]
M2 function
See Table 25 and Table 26 (default = 0xb0000000)
0x0203 [7] M3 in/out In/out control for the M3 pin (same as M0)
[6:0] M3 function See Table 25 and Table 26 (default = 0xb0000000)
0x0204 [7] M4 in/out In/out control for the M4 pin (same as M0)
[6:0] M4 function See Table 25 and Table 26 (default = 0xb0000000)
0x0205 [7] M5 in/out In/out control for the M5 pin (same as M0)
[6:0] M5 function See Table 25 and Table 26 (default = 0xb0000000)
0x0206 [7] M6 in/out In/out control for the M6 pin (same as M0)
[6:0] M6 function See Table 25 and Table 26 (default = 0xb0000000)
0x0207 [7] M7 in/out In/out control for the M7 pin (same as M0)
[6:0] M7 function See Table 25 and Table 26 (default = 0xb0000000)
1
The default setting for all the multifunction pins is as an unused control input pin.
Table 49. IRQ Pin Output Mode
Address
Bits
Bit Name
Description
0x0208 [7:2] Unused
[1:0] IRQ pin output mode Select the output mode of the IRQ pin
00 (default) = NMOS, open drain (requires an external pull-up resistor)
01 = PMOS, open drain (requires an external pull-down resistor)
10 = CMOS, active high
11 = CMOS, active low