LF4415 Ver la hoja de datos (PDF) - LUXPIA
Número de pieza
componentes Descripción
Lista de partido
LF4415 Datasheet PDF : 32 Pages
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Register B
Register C
Depth
Expansion:
Chip Position
PRELIMINARY
LF4460
LF4430
LF4415
Video Memory / FIFO
Configuration Register Definitions
FRAME
MEMORY
Register B [7:0] = Reserved
Register C [7:4] = BASE_ADDR[3:0] - position of chip in depth expansion; BASE_ADDR[3:0]
must not exceed NUM_DEV[3:0]
0000:
single-chip operation OR device 1 of N (DEFAULT)
0001:
device 2 of N
......
device n of N
Depth
Expansion:
# of Devices
Register C [3:0] = NUM_CASC_DEV[3:0] - number of devices tied together* for
a concatenated address space. (ignore unless performing Depth Expansion)
0000: single device (DEFAULT) - no depth expansion
0001:
...
2x depth - two devices; sequential R/W addresses, modulo 7,761,600 (8bit mode)
...
1100: 12x depth - twelve devices; sequential R/W addresses, modulo 23,284,800 (8bit mode)
*Note limits on number of possible device connections (related to WIDTH control):
8bit data: 4 or less LF4430s (W = 00)
10bit data: 5 or less LF4430s (W = 01)
12bit data: 6 or less LF4430s (W = 1x)
Register D, E, F
Programamble
Empty Flag 0
Definition
Register D [7:6] Reserved [LOAD ‘00’ IF MODIFYING REG D]
Registers D, E, F = EMPTY_THRESH_0[21:0] - PE0 Programmable threshold for the Partially
Empty Flag behavior
EmptyThresh0 is a 22bit constant used to define the emptiness threshold for the PE0 flag. The default
is 1/80th of the total memory space in single channel mode. See Excel file on logicdevices.com
Application Notes area for setting this threshold. In single channel and cascade modes, the
EmptyThresh0 applies. In dual channel mode, this threshold only applies to channel 0’s PE flag.
Register D= EMPTY_THRESH_0 [21:16] (DEFAULT= 00000)
5:0=EMPTY_THRESH_0 [21:16] Most significant 6 bits of the 22bit EmptyThresh0
Register E = EMPTY_THRESH_0 [15:8] (DEFAULT= 00000000)
7:0=EMPTY_THRESH_0 [15:8] Middle byte of the 22bit EmptyThresh0
Register F = EMPTY_THRESH_0 [7:0] (DEFAULT= 00000000)
7:0=EMPTY_THRESH_0 [7:0] Least significant byte of the 22bit EmptyThresh0
LOGIC Devices Incorporated
www.logicdevices.com
20
High Performance Memory Product
January 23, 2008 LDS-44xx-A
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