PNX1502E/G,557 NXP Semiconductors, PNX1502E/G,557 Datasheet - Page 350
PNX1502E/G,557
Manufacturer Part Number
PNX1502E/G,557
Description
IC MEDIA PROC 300MHZ 456-BGA
Manufacturer
NXP Semiconductors
Specifications of PNX1502E/G,557
Applications
Multimedia
Core Processor
TriMedia
Controller Series
Nexperia
Interface
I²C, 2-Wire Serial
Number Of I /o
61
Voltage - Supply
1.23 V ~ 1.37 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
456-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Type
-
Ram Size
-
Lead Free Status / Rohs Status
Compliant
Other names
568-1298
935277748557
PNX1502E/G
935277748557
PNX1502E/G
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Philips Semiconductors
Volume 1 of 1
PNX15XX_SER_3
Product data sheet
Figure 4:
Clock Gating Logic
3.2.3 BLEN state
3.2.4 PEPED state
3.3 Counter
3.4 Gating Logic
dce_sync
clk_lcd
In the BLEN state, when the lcd_enbl signal is de-asserted, the TFTBKLTON signal is
de-asserted and the counter is loaded with BKLT_DCE_DELAY value. There is no
state transition. When the counter reaches zero with lcd_enbl signal still de-asserted,
the state machine moves to the DCEN state de-asserting the dce signal. During this
transition, the counter is loaded with DCE_PWREN_DELAY value.
If the lcd_enbl signal is asserted in the BLEN state, the TFTBKLTON signal is
asserted and there is no state change.
In the PEPED state, the state machine waits for the counter to reach zero to force the
PWREN_PWREN_DELAY and goes back to the IDLE state. This completes the
power down sequencing. If the lcd_enbl signal is asserted when the counter reaches
zero, a new power up sequencing is started.
The counter used to calculate the delays is a 26-bit down counter. It starts counting
down as soon as it is loaded with a delay value and asserts the cnt_done signal when
the counter reaches zero. It runs on the 27 MHz clock (input PNX15xx Series crystal).
The control signals from the state machine are in the clk_lcd_tstamp clock domain.
They are first synchronized to the clk_lcd clock domain before using them to gate the
data/control signals from the QVCP. The clk_lcd clock is also gated without any glitch
in the gating logic. The clock gating circuit is shown in
Rev. 3 — 17 March 2006
clk_lcd_out
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Figure
Chapter 10: LCD Controller
PNX15xx Series
4.
10-5
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