r8a66120ffa Renesas Electronics Corporation., r8a66120ffa Datasheet - Page 13

• Manufacturer Part Number: r8a66120ffa
• Description: 4m-bit X 2 Multiple Field Memory
• Manufacturer: Renesas Electronics Corporation.

REJ03F0161-0170 Rev.1.70 May.16.2008
R8A66120FFA
page 13 of 14
Reading shortest a data written at n cycle on write-side
In order to read out a written data, CK should be inputted for 256 cycles and more after the data is written.
In following figure, an example is shown of reading out the data written at the rising edge of CK (*1) at n cycle on write-side.
Output data becomes invalid when this restriction isn’t fulfilled.
Also, take care of the restriction to the interval between a write cycle and a read cycle (ref. page10).
Reading longest a data written at n cycle on write-side : 1-line Delay
Output Q of n cycle<1>* can be read out until n cycle<1>* on read-side and n cycle<2>* on write-side overlap each other.
CK
RE
Dn
Qn
CK
Qn
Dn
(n-1)<1>*
(n-1)<0>*
n-1 cycle
n cycle＜1＞*
n cycle＜0＞*
(n-1)
n cycle
＊1
(n)
(n)<0>*
(n)<1>*
n+1 cycle
(n+1)
256 cycles or more
n-2 cycle
n+253
cycle
0 cycle＜2＞*
0 cycle＜1＞*
(n+253)
invalid
n-1 cycle
n+254
cycle
(0)<2>*
(0)<1>*
(n+254)
invalid
Disable
cycle
n+255
cycle
HIGH-Z
(n+255)
<0>* , <1>* and <2>* indicate a line number.
n cycle
n+256
cycle
(n-1)<2>*
(n-1)<1>*
(n+256)
(n)
n+1 cycle
n+257
cycle
n cycle＜2＞*
n cycle＜1＞*
(n+257)
(n+1)
n+2 cycle
n+258
cycle
(n)<2>*
(n)<1>*
(n+258)
(n+2)
･･･Write side
･･･Read side
･･･Write side
･･･Read side