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参数资料
| 型号： | IDT88P8344BHGI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPI EXCHANGE 4 x SPI-3 TO SPI-4 Issue 1.0 |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA820 |
| 封装： | GREEN, PLASTIC, BGA-820 |
| 文件页数： | 45/98页 |
| 文件大小： | 601K |
| 代理商： | IDT88P8344BHGI |
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45
IDT88P8344 SPI EXCHANGE 4 x SPI-3 TO SPI-4
INDUSTRIAL TEMPERATURE RANGE
APRIL 10, 2006
For an ideal case, there is zero jitter on clock an data, zero skew, the clock
high and low level phase are symmetrical. For randominput data on each lane,
the counters Cn=CNTn(t)+CNTn(t+1)+. . .+CNTn(t+T), where T is a time
window to do the statistics computation, will increment as follows:
Counter
Value
C
0
0
C
1
0
C
2
P
C
3
0
C
4
0
C
5
0
C
6
0
C
7
K
C
8
0
C
9
0
Where P and K are non-zero and need to be a large enough value mark
the transition position of a clock and define the position.
Software for implementing the Eye-Opening Check
In the IDT88P8344, a set of diagnostic registers are provided for implement-
ing an eye-opening check. The SPI-4 interface has 16 data lanes and one
control lane on ingress, 2 status lanes on egress, making a total of 19 lanes.
The SPI-4 ingress bit alignment window register defines the window T stated
above, based on which the signal statistics are computed. It is recommended
to use the default value. The MEASURE_BUSY bit indicates the status of the
internal measurement operation.
The SPI-4 ingress lane measure register selects the lane statistics counters
to be read, a write to this register triggers the eye-opening check process to the
selected lanes and the MEASURE_BUSY bit will be set accordingly indicating
the measuring process is active. The MEASURE_BUSY bit is cleared internally
which indicates that the measuring process is complete. The measured result
of counters C
through C
9
will be available in the SPI-4 ingress bit alignment
counter registers.
Note that there is one SPI-4 ingress lane measure register and 19 SPI-4
ingress bit alignment counter registers.
The following pseudo code shows how to check the eye opening:
Because the SPI-4 ingress bit alighnment counter register has a 10-bit width,
the maximumcounter value is 0x3ff.
If the counter values of a lane are:
0, 0, 0x3ff, 0, 0, 0, 0, 0x3ff, 0, 0
The eye open is perfect; there is very good signal integrity on input signals
of the SPI-4 interface.
In each sample position represents a “tap”. Depending on the delay in a lane,
even a small jitter value of 1ps on the lane or the clock, may cause eye closing
that can be detected by observing the counter values. In an ideal case with zero
delay, if the jitter on a data lane or clock is less than one tap interval (peak to
peak), the jitter will not be reflected in counters. While the eye open check can
indicate excessive jitter there are limtations in providing a accurate measure-
ment using this method.
Theoretically as long as one tap accumulates enough non-zero samples for
each 2 bits within a clock cycle the sampled signal position will be correct and
the interface will function correctly. The more counters that have zero values,
the better the eye opening.
#define SPI-4_ingress_lane_measure_register 0x8801 /*
register address in SPI exchange device*
/
#define SPI-4_ingress_bit_alignment_counter_register(0) 0x8802
#define SPI-4_ingress_bit_alignment_counter_register(1) 0x8803
#define SPI-4_ingress_bit_alignment_counter_register(2) 0x8804
#define SPI-4_ingress_bit_alignment_counter_register(3) 0x8805
#define SPI-4_ingress_bit_alignment_counter_register(4) 0x8806
#define SPI-4_ingress_bit_alignment_counter_register(5) 0x8807
#define SPI-4_ingress_bit_alignment_counter_register(6) 0x8808
#define SPI-4_ingress_bit_alignment_counter_register(7) 0x8809
#define SPI-4_ingress_bit_alignment_counter_register(8) 0x880a
#define SPI-4_ingress_bit_alignment_counter_register(9) 0x880b
For lane=0 to K step 1 /*the number K depend on status mode: K=18 in LVDS status mode*/
{ /* K=16otherwise */
write #ane, SPI-4_ingress_lane_measure_ register
wait until BUSY=0 /*BUSY: bit 8 of SPI-4_ingress_lane_measure_register, at address
0x8801*/
for i=0 to 9 step 1
{
read C(i), SPI-4_ingress_bit_alignment_counter_register(i)
}
print C(0), C(1), C(2), C(3), C(4), C(5), C(6), C(7), C(8), C(9)
}
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| IDT88P8344BHI | 功能描述:IC SPI3-SPI4 EXCHANGE 820-PBGA RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA（27x27） 包装:散装 |
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