lh79520 NXP Semiconductors, lh79520 Datasheet - Page 24

• Manufacturer Part Number: lh79520
• Description: Lh79520 System-on-chip
• Manufacturer: NXP Semiconductors

LH79520
AC Specifications
after a reference clock signal. The illustration in Figure
7 represents all cases of these sets of measurement
parameters; except for the Asynchronous Memory
Interface — which are referenced to Address Valid.
• HCLK, the System Bus clock
• PCLK, the Peripheral Bus clock (locked to HCLK in
• SSPCLK, the Synchronous Serial Interface clock
• UARTCLK, the UART Interface clock
• LCDDCLK, the LCD Data clock from the
• and SDCLK, the SDRAM clock.
point of the clock to the 50 % point of the signal. See
Figure 7.
24
the LH79520)
LCD Controller
All signals described in Table 8 relate to transitions
The reference clock signals in this design are:
All signal transitions are measured from the 50 %
REFERENCE
SIGNAL (O)
SIGNAL (I)
CLOCK
OUTPUT
INPUT
Figure 7. LH79520 Signal Timing
tOVXXX
Rev. 01 — 16 July 2007
NXP Semiconductors
represents the amount of time for the output to become
valid from the rising edge of the reference clock signal.
Maximum requirements for tOVXXX are shown in
Table 8.
amount of time the output will be held valid from the ris-
ing edge of the reference clock signal. Minimum
requirements for tOHXXX are listed in Table 8.
amount of time the input signal must be valid before the
rising edge of the clock signal. Minimum requirements
for tISXXX are shown in Table 8.
amount of time the memory output must be held valid
from the rising edge of the reference clock signal. Min-
imum requirements are shown in Table 8.
tISXXX tIHXXX
For outputs from the LH79520, tOVXXX (e.g. tOVA)
The signal tOHXXX (e.g. tOHA) represents the
For Inputs, tISXXX (e.g. tISD) represents the
The signal tIHXXX (e.g. tIHD) represents the
tOHXXX
Preliminary data sheet
System-on-Chip
79520-34