AS3525-A/-B C22O22
Data Sheet, Confidential
7.3.12 DBOP - Data Block Output Port
Purpose of this ARM APB peripheral module is a high-speed data output port that can support data transfer to various display controllers based on
synchronous control interfaces. Programmability of polarity and timing of the generated control signals makes it possible to support various kinds of
displays. Example of a supported display controller is the Hitachi HD77766R LCDE controller.
From the programmers point of view the DBOP module can be serviced by DMA accesses. With the large size of the data FIFO and the
programmable interrupt request conditions the overhead for SW is minimised. Simple read instructions to read for example a status register of the
LCD controller are also supported.
The usage of this cell results in a great performance boost compared to the standard ARM GPIO PrimeCell™ architecture.
Features
•
•
•
•
•
•
•
•
•
•
•
APB bus interface
support for direct memory access (DMA)
data output FIFO with 128 words (32 bit wide)
8 or 16 bit parallel data output (configurable)
4 control outputs - flexible programming of the signal waveforms with respect to polarity and timing
programmable even/odd control output generation
8 or 16 bit parallel data input register with programmable read strobe
programmable conditions for interrupt generation based on FIFO flags
usage of FIFO for simple division of APB clock domain and output clock domain
programmable data output rate in range of 0.05 to 4 MHz
APB Clock & DBOP Clocks are synchronous.
Figure 33 DBOP Block Diagram
DBOP
FiFo 128x32
Dual ported
RAM 128x32
PRESETn
PSEL
32
32
Dout
PENABLE
dbop_d[7:0] / xpc[7:0]
dbop_d[11:8] / xpb[7:4]
register
PWRITE
Amba
APB
Interface
push
PADDR[11:2]
pop
lb_select,
hb_select
dbop_d[15:12]
symetric FiFo
Controller
PWDATA[31:0]
FiFo
push
status
FiFo
pop
status
PRDATA[7:0]
PCLK
c0 / xpb[0]
c1 / xpb[1]
Control
Signal
Generator
c2 / xpb[2]
c3 / xpb[3]
Register
Block
dinStrobe
dataValid
8
Din register
din[7:0]
DBOPDMASREQ
DBOPDMABREQ
DMA
Interface
Interrupt
Generator
DBOPDMACLR
DBOPIRQ
dbop_clk
© 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com Revision 1.13
83 - 194
AMSCO [ AMS(艾迈斯) ]
