HYE18P32160AC Datasheet, PDF (26/53 Pages) Infineon Technologies AG – 32M Synchronous Burst CellularRAM

HYE18P32160AC(-/L)9.6/12.5/15
32M Synchronous Burst CellularRAM
Functional Description
Field
WP
WC
IMP
BW
BL
Res
Bits Type¹⁾ Description
10
w
WAIT Polarity
The WAIT polarity control bit allows the user to define the polarity of the WAIT output
signal. The WAIT output line is used during a synchronous read burst to signal when
the output data is invalid.
0 active low
1 active high (default)
8
w
WAIT Configuration
The WAIT signal configuration control bit specifies whether the WAIT signal is
asserted at the time of the delay or whether it is asserted one clock cycle in advance.
0 WAIT is asserted during the delay
1 WAIT is asserted one data cycle before the delay (default)
5
w
Output Impedance
For adaptation to different system characteristics the output impedance can be
configured.
0 Full drive for 50 Ω systems (default)
1 Quarter drive
3
w
Burst Wrap
The burst wrap control bit defines whether there is a wrap around within a burst
access or not. In case of fixed 8-word burst length, this means that after word7, word0
is going to be output in wrap mode.
In case of continuous burst mode the internal address counter will wrap from the last
address, 1FFFFF_H to 000000_H regardless of the setting.
Please note this setting is only used for burst read mode, since burst write mode is
always continuous.
0 wrap
1 no wrap (default)
[2:0] w
Burst Length (Burst Read only)
Via the burst length field the user can select between fixed burst lengths of 4, 8, and
16 and any arbitrary burst length by choosing the continuous mode option. In
continuous mode the burst length is controlled by the active low period of the read
control lines CS and OE.
Please note this setting is only used for burst read mode. Burst write mode is always
continuous independent of this register setting.
001 4-word burst
010 8-word burst
011 16-word burst
111 continuous (default)
20,
w
[18:16],
14, 9, 7,
4
Reserved
must be set to ‘0’
1) w: write-only access
Data Sheet
26
V2.0, 2003-12-16