PDF UM8321 Data sheet ( Hoja de datos )

Número de pieza	UM8321
Descripción	CRT Video Attributtes Controller
Fabricantes	UMC
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No Preview Available ! (l)UMC UM8321 Features • On chip attributes logic Reverse video Character blank Character blink Underline Full/half intensity • Four modes of operation Wide graphics Thin graphics Character mode without underline Character mode with underline • On Chip logic for double height double width characters • Accepts scan line information in parallel or serial format General Description The UM8321 Video Attributes Controller (VAC) is an n-channel MaS/LSI device containing graphics logic, attributes logic, data and attributes latches, cursor control and a high speed video shift register. A character generator ROM and a CRT Video attributes controller UM8321 provide all of the major circuitry for the display portion of a CRT video terminal. The UM8321 serial video output may be connected directly to 3 CRT monitor's video input. The UM8321 attributes include: reverse video, underline, character blank, character blink, and full/half intensity selection. In addition. When used in conjunction with the UM9007, the UM8321 will provide double height or double width characters. Four programmable cursor modes are provided on the UM8321. They are underline, blinking underline, reserve video character block, and blinking reverse video character block. When used in the serial scan line input mode, the cursor mode may be selected via two input pins. When used in the parallel scan line input mode, the cursor mode is a mask program option and is fixed at the time of manufacture. Two graphics modes are provided. In the wide graphics mode, the UM8321 produces a graphic entity the size of the character block. The graphic entity contains eight parts, each of which is associated with one bit of the input byte, thereby providing 256 unique graphic symbols. The thin graphics mode enables the user to create thin line drawings and forms. • Four cursor modes dynarnically selectable via 2 input pins Underline Blinking underline Reverse video Blinking reverse video • Programmable character blink rate • Programmable cursor blink rate • On chip data and attribute latches • +5 volt operation • TTL compatible • MaS n-Channel silicon gate • Compatible with UM9007 In both graphics rnodes, continuous horizontal and vertical lines may be drawn. Additional flexibility is provided by allOWing the mask programming of the placement and dimensions of the blocks or lines within a character block. In the thin graphics mode, mask programming allows serrated horizontal or vertical lines. Pin Configuration 00 MSO MS1 REVIO CHABL BLINK INTIN +5V ATTEN INTOUT CURSOR RETBL LD/SH VIOEO 01 02 03 04 05 06 07 VSYNC GNO SLO/SLO SL l/SLG SL2/BLC SL3/BKC VOC 1 page Pin Description (Continued) Pin No. 12 Name Retrace Blank Symbol RETBL 13 Load/Shift LD/SH 14 Video VIDEO UM8321 Functions When this input is high, the parallel inputs to the video shift register are unconditionally cleared to all zeros and loaded on the next LD/SH pulse. This forces the VIDEO output to a low voltage level, independent of all attributes, for blanking the CRT during horizontal and vertical retrace time. The 8 bit video shift register parallel-in load or serial-out shift operation is established by the state of this input. When high, this input enables the shift register for serial shifting with each video dot clock pulse (VDC input). When low, the video shift register is parallel loaded on the next video dot clock pulse and all data and attributes are moved to the next position in the internal pipeline. In addition, input data and attributes are latched on the positive transition of LD/SH. The Video output provides the serial dot stream to the CRT. Video is shifted out on the rising edge of the video dot clock VDC. The timing of LD/SH input will determine the number of backfill dots. See Figure 1. VDC LD/SH ALL INPUTS (EXECPT VDC, LD/SH) VDC VIDEO OR INTOUT RETBL CURSOR (FOR DOUBLE WIDTH) 1=tow =1-- Figure 1. UM8321 Input/Output Timing PIN No. 15 16 Name Symbol Video Dot Clock VDC Scan line SL3/BKC 3/B lock Cursor I Functions This input clock controls the rate at which video is shifted out on the VIDEO output. This input has two separate functions depending on the way scan line information is presented to the UM8321. Parallel scan line mode - This input is the most significant' bit of the binary scan line row address. Serial scan line mode - This input controls the cursor's physical dimen- sions.' If high the cursor will appear as a reverse video block (the entire character cell will be displayed in reverse video). If low, the cursor will appear as an underline on the scan line(s) programmed. • 5-61 5 Page eUMC UM8321 SL3-SLO ROW # C7 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 RO Rl R2 R3 07 R4 R5 R6 R7 R8 R9 Rl0 Rl1 R12 R13 R14 R15 L--- C6 C5 C4 C3 04 DO D2 01 05 '-- C2 C1 CO 03 BF BF 0 --""1 __ J I I 06 I I ---l - - II I I I I - II - --i L... HORIZONTAL LENGTH VERTICAL POSITION 02 C7-C3 PROG RAMMABLE 03 C3-BF PROGRAMMABLE 04 C7-BF* PROGRAMMABLE 05 C7-BF* PROG RAMMABLE VERTICAL HEIGHT HORIZONTAL POSITION DO RO-R5 PROGRAMMABLE 01 R6-R15 PROGRAMMABLE 06 RO-R 15* PROGRAMMABLE 07 RO-R15* PROGRAMMABLE • These values are fixed Figure 5. Thin Graphics Mode for Standard UM8321 Table 3. Thin Graphics Mask Programming Options Options Choices Backfill C1 or CO Horizontal position for D2 and D3 04 05 any scan line(s) RO-R15 any scan line(s) RO-R15 any scan line(s) RO-R 15 Horizontal length for 022 032 any continuous dots C7-CO, BF all dots not covered by 02 Blanked dots for serrated horizontal lines D2 D3 D4 and D5 any dot(s) C7-CO, BF any dot(s) C7-CO, BF any dot(s) C7 -CO, BF Vertical position for 00 and 01 061 07 1 any dot(s) O-CO, BF any dot(s) C6-CO, BF any dot(s) C7-CO Vertical length for 00 any scan line(s) 01 all scan lines not used by DO 06 no choice; always RO-R 15 07 no choice; always RO-R15 1 - 07 must always come before 06 With no overlap; otherwise 06 IS lost. 2 - 02 and D3 must always over only one dot. Standard UM8321 CO R5 RO R11 C7-C3 C3-BF none none none C3 BF C7 RO to R5 R6 to R15 RO to R15 RO to R15 5-67 11 Page

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