Samsung S5PC100, User Manual, Page: 286 / 1863

INTELLIGENT ENERGY MANAGEMENT S5PC100 USER’S MANUAL (REV1.0)
2.5-14
clock_div
perf_lvl_zero & mresult = vdd_stable
<
step_dir_int = 0
step_upward = 0
> step_dir_int = 1
=
clock_div ||
(apc_target_index != apc_target_index_prv)
clkdivcnt[5:0]
default
clkdivcnt
+1
precnt =
{ APC_VDDCHKD [7:0],
APC_VDDCHK [7:4]}
cnt =
APC_VDDCHK [3:0]
Integral = 0
mresult = 0
clock_div
clkdivcnt ==
APC_SLK_SMP
clock_div
precnt down to 0
Voltage meet condition (double check, then mresult = 1)
1) Below reference, but less than noise_limit_int
• Integral is positive (Voltage under-supplied)
• Integral is less than or equal to noise_limit_int[4:0]
2) Above reference
• Integral is negative (Voltage over-supplied)
• Absolute value of Integral is less than APC_OVSHT_LMT [7:0]
Low_VDD_timeout : Too much time taken to increase voltage
step_upward = 1 when Integral is positive and step_int_dir == 1
APC_UNSHT_NOISE [5:4]
00 5’h00
01
5’h10 10
5’h04
11 5’h1F
noise_limit_int
Undershoot condition
1) Positive slack (Voltage under-supplied)
2) Slack is higher than APC_UNSHT_NOISE [3:0]
3) Above occurs more than 10 times
noise_limit_int
step_upward
6’h00
cnt down to 0
Accumulate slack to integral
except overflow is expected
apc_target_index[7:0]
apc_target_index_prv
Figure 2.5-5 IEM Closed-loop Control Flow in APC1